Thanks for your tip.
I am now finally customizing the board and I thought it would be easy to find the part in the template but somehow I am confused.

Could someone who knows more about the source code tell me, which part needs to be edited for this?

This is the template:

[code] <!-- <? //UBBTREMARK -->
// File Version 6.5.2b1

<!-- echo <<<UBBTPRINT -->

$tbopen
<tr>
<td colspan="6" class="darktable">
<table width="100%" cellpadding="0" cellspacing="0">
<tr>
<td colspan="2" class="catandforum">
<font class="catandforum">
<a href="{$config['phpurl']}/ubbthreads.php{$var_start}Cat{$var_eq}$Cat{$var_sep}C{$var_eq}$C">
$CatName
</a>
>>
<b>$Title</b>
</font>
</td>
<td align="right" valign="bottom">
<table border="0" class="tablesurround">
<tr>
<td class="navigation" nowrap="nowrap">

<!-- postoption is either newpost.gif or greynewpost.gif -->
$newpoststart
<img src="{$config['images']}/$postoption" alt="{$ubbt_lang['MAKE_A_NEW']}" border="0" {$images['newpost']} $imagestyle />
{$ubbt_lang['NEW_POST_ICON']}
$newpoststop
&nbsp;
</td>
<td class="navigation" nowrap="nowrap">
<!-- prevoption is either previous.gif or greyprevious.gif -->
$prevstart
<img src="{$config['images']}/$prevoption" alt="{$ubbt_lang['PREV_PAGE']}" border="0" {$images['previous']} $imagestyle />
{$ubbt_lang['PREV_ICON']}
$prevstop
&nbsp;
</td>
<td class="navigation" nowrap="nowrap">
<a href="{$config['phpurl']}/ubbthreads.php{$var_start}Cat{$var_eq}$Cat{$var_sep}C{$var_eq}$C">
<img src="{$config['images']}/all.gif" alt="{$ubbt_lang['FORUM_IND']}" border="0" {$images['all']} $imagestyle />
{$ubbt_lang['INDEX_ICON']}
</a>
&nbsp;
</td>
<td class="navigation" nowrap="nowrap">
<!-- nextoption is either next.gif or greynext.gif -->
$nextstart
<img src="{$config['images']}/$nextoption" alt="{$ubbt_lang['NEXT_PAGE']}" border="0" {$images['next']} $imagestyle />
{$ubbt_lang['NEXT_ICON']}
$nextstop
&nbsp;
</td>
<td class="navigation" nowrap="nowrap">
$changestart
<img src="{$config['images']}/$changeoption" alt="$changealt" border="0" {$images['expand']} $imagestyle />
$changetext
$changestop
&nbsp;
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
$tbclose
<br />

$tbopen
<tr>
<td align="center" width="49%" class="tdheader" colspan="3">
<a href="{$config['phpurl']}/postlist.php{$var_start}Cat{$var_eq}$Cat{$var_sep}Board{$var_eq}$Board{$var_sep}page{$var_eq}$page{$var_sep}sb{$var_eq}$sortsubject">
{$ubbt_lang['SUBJECT_TEXT']}
</a>
$SubjectS
</td>
<td align="center" nowrap="nowrap" width="15%" class="tdheader">
<a href="{$config['phpurl']}/postlist.php{$var_start}Cat{$var_eq}$Cat{$var_sep}Board{$var_eq}$Board{$var_sep}page{$var_eq}$page{$var_sep}sb{$var_eq}$sortposter">
{$ubbt_lang['POSTER_TEXT']}
</a>
$PosterS
</td>
<td nowrap="nowrap" width="5%" class="tdheader" align="center">
<a href="{$config['phpurl']}/postlist.php{$var_start}Cat{$var_eq}$Cat{$var_sep}Board{$var_eq}$Board{$var_sep}page{$var_eq}$page{$var_sep}sb{$var_eq}$sortviews">
{$ubbt_lang['THREAD_VIEWS']}
</a>
$ViewsS
</td>
<td nowrap="nowrap" width="5%" class="tdheader" align="center">
<a href="{$config['phpurl']}/postlist.php{$var_start}Cat{$var_eq}$Cat{$var_sep}Board{$var_eq}$Board{$var_sep}page{$var_eq}$page{$var_sep}sb{$var_eq}$sortreplies">
{$ubbt_lang['REPL_TEXT']}
</a>
$RepliesS
&nbsp;&nbsp;
</td>
<td nowrap="nowrap" width="5%" class="tdheader" align="center">
<a href="{$config['phpurl']}/postlist.php{$var_start}Cat{$var_eq}$Cat{$var_sep}Board{$var_eq}$Board{$var_sep}page{$var_eq}$page{$var_sep}sb{$var_eq}$sortrating">
{$ubbt_lang['RATING']}
</a>
$RatingS
&nbsp;&nbsp;
</td>
<td nowrap="nowrap" width="20%" class="tdheader" align="center">
<a href="{$config['phpurl']}/postlist.php{$var_start}Cat{$var_eq}$Cat{$var_sep}Board{$var_eq}$Board{$var_sep}page{$var_eq}$page{$var_sep}sb{$var_eq}$sortdate">
$datecolumn
</a>
$LastS
</td>
</tr>
<!-- BEGIN POST LOOP DO NOT DELETE -->
<!-- UBBTPRINT; -->
<!-- for ($i=0;$i<$postrowsize;$i++) { //UBBTREMARK -->
<!-- echo <<<UBBTPRINT -->
<tr>
<td align="left" class="{$postrow[$i]['color']}" valign="top" width="1%">
<img alt="$alt" src="{$config['images']}/{$postrow[$i]['specialicon']}" {$images['folders']} $imagestyle />
</td>
<td align="left" class="{$postrow[$i]['color']}" valign="top" width="1%">
<img alt="$alt" src="{$config['images']}/{$postrow[$i]['icon']}" {$postrow[$i]['imagesize']} $imagestyle />
</td>
<td align="left" class="{$postrow[$i]['color']}" valign="top" width="48%">
<img alt="." src="{$config['images']}/blank.gif" width="{$postrow[$i]['indentsize']}" {$images['blank']} hspace="0" />
<a href="{$config['phpurl']}/$mode.php{$var_start}Cat{$var_eq}$Cat{$var_sep}Number{$var_eq}{$postrow[$i]['Number']}{$var_sep}an{$var_eq}{$postrow[$i]['announce']}{$var_sep}page{$var_eq}$page{$postrow[$i]['goto']}">
{$postrow[$i]['Subject']}
</a>
{$postrow[$i]['pageprint']}
</td>
<td align="center" nowrap="nowrap" class="{$postrow[$i]['color']}" valign="top">
{$postrow[$i]['Username']}{$postrow[$i]['UserStatus']}&nbsp;&nbsp;
</td>
<td align="center" class="{$postrow[$i]['color']}" valign="top">
{$postrow[$i]['Views']}
</td>
<td align="center" nowrap="nowrap" class="{$postrow[$i]['color']}" valign="top">
{$postrow[$i]['Replies']} {$postrow[$i]['newreplies']}
</td>
<td align="center" nowrap="nowrap" class="{$postrow[$i]['color']}" valign="top">
{$postrow[$i]['Rating']}
</td>
<td nowrap="nowrap" align="center" class="{$postrow[$i]['color']}" valign="top">
<span class="small">{$postrow[$i]['time']}
<br />
{$postrow[$i]['lastposter']}
</span>
</td>
</tr>
<!-- UBBTPRINT; -->
<!-- } //UBBTREMARK -->
<!-- echo <<<UBBTPRINT -->

<!-- END OF LOOP -->
<tr>
<td colspan="8" class="tdheader" align="right">
$pagejumpers
</td></tr>
$tbclose
<br />

$tbopen
<tr>
<td colspan="3" class="tdheader">
{$ubbt_lang['B_INFO']}
</td>
</tr>
<tr>
<td width="33%" class="lighttable" valign="top">
<span class="small">
$r {$ubbt_lang['C_ONLINE2']} $a {$ubbt_lang['C_ONLINE4']}
<br />
<br />
{$ubbt_lang['USER_MOD']}: $modlist
<br />
<br />
$favoriteboardlink
$subscribeboardlink
<br />
</span>
</td>
<td valign="top" align="left" class="lighttable" width="33%">
<span class="small">
<b>{$ubbt_lang['PERMPRINT']}</b>
<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
$writeperm
<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
$replyperm
<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
$htmlcode
<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
$ubbcode
<br />
<br />
</span>
</td>
<td class="lighttable" valign="top">
<b>{$ubbt_lang['LEGEND']}</b>
<br />
<table border="0" width="100%">
<tr>
<td class="lighttable" width="50%">
<span class="small">
<img src="{$config['images']}/newfolder.gif" alt="{$ubbt_lang['L_NEW']}" border="0" /> {$ubbt_lang['L_NEW']}
</span>
</td>
<td class="lighttable">
<span class="small">
<img src="{$config['images']}/nonewfolder.gif" alt="{$ubbt_lang['L_NONEW']}" border="0" /> {$ubbt_lang['L_NONEW']}
</span>
</td>
</tr>
<tr>
<td class="small">
<img border="0" src="{$config['images']}/announce.gif" alt="{$ubbt_lang['ANNOUNCE']}" /> {$ubbt_lang['ANNOUNCE']}
</td>
<td class="small">
<img border="0" src="{$config['images']}/sticky.gif" alt="{$ubbt_lang['STICKY']}" /> {$ubbt_lang['STICKY']}
</td>
</tr>
<tr>
<td class="small">
<img border="0" src="{$config['images']}/moved.gif" alt="{$ubbt_lang['MOVED']}" /> {$ubbt_lang['MOVED']}
</td>
<td class="small">
<img border="0" src="{$config['images']}/calevent.gif" alt="{$ubbt_lang['EVENT']}" /> {$ubbt_lang['EVENT']}
</td>
</tr>
<tr>
<td class="small">
<img border="0" src="{$config['images']}/poll.gif" alt="{$ubbt_lang['POLL']}" /> {$ubbt_lang['POLL']}
</td>
<td class="small">
<img border="0" src="{$config['images']}/file.gif" alt="{$ubbt_lang['FILE']}" /> {$ubbt_lang['FILE']}
</td>
</tr>
<tr>
<td colspan="2" class="small">
<img border="0" src="{$config['images']}/hottopic.gif" alt="{$ubbt_lang['HOT_TOPIC']}" /> {$ubbt_lang['HOT_TOPIC']}
</td>
</tr>
</table>

</td>
</tr>
<tr>
<td class="lighttable" colspan="3">
<table border="0" width="100%">
<tr>
<td width="50%" align="left">
<form method="post" action="{$config['phpurl']}/postlist.php">
<input type="hidden" name="Cat" value="$Cat" />
<input type="hidden" name="Board" value="$Board" />
<input type="hidden" name="page" value="0" />
{$ubbt_lang['SHOW_P']}
<select name="o" class="formboxes">
<option value="1" $d1>{$ubbt_lang['ACT_1']}</option>
<option value="2" $d2>{$ubbt_lang['ACT_2']}</option>
<option value="7" $w1>{$ubbt_lang['ACT_1w']}</option>
<option value="14" $w2>{$ubbt_lang['ACT_2w']}</option>
<option value="21" $w3>{$ubbt_lang['ACT_3w']}</option>
<option value="31" $m1>{$ubbt_lang['ACT_1m']}</option>
<option value="93" $m3>{$ubbt_lang['ACT_3m']}</option>
<option value="186" $m6>{$ubbt_lang['ACT_6m']}</option>
<option value="365" $y1>{$ubbt_lang['ACT_1y']}</option>
<option value="all" $allofthem>{$ubbt_lang['ACT_all']}</option>
</select>
<input type="submit" name="changeit" value="{$ubbt_lang['CHANGE_IT']}" class="buttons" />
</form>
</td>
<td width="50%" align="right">
$jumpbox
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td colspan="3" align="center" class="lighttable">
<form method="post" action="{$config['phpurl']}/dosearch.php">
<input type="hidden" name="Cat" value="$Cat" />
<input type="hidden" name="Forum" value="f$bonumber" />
<input type="hidden" name="daterange" value="0" />
<input type="hidden" name="where" value="bodysub" />
<input type="hidden" name="fromsearch" value="1" />
<input type="hidden" name="checkwords" value="1" />
{$ubbt_lang['SEARCH_FORUM']}
<input type="text" name="Words" class="formboxes" />
<input type="submit" name="textsearch" value="{$ubbt_lang['TEXT_SEARCH']}" class="buttons" />
</form>
</td>
</tr>
$tbclose
<!-- UBBTPRINT; -->
<!-- /* UBBTREMARK */ ?> -->