go to your admin cpanel -- general -- HTML Includes

put:
HTML
<div class="muh4h4ha">
<a href="http://netnotes.netlearning.com/ubbthreads.php?ubb=cfrm">
<div class="nlheader"></div>
</a>
</div>

save it..

that should work, except that you prolly want to give your .nlheader some height to push the forum down and reveal the header graphic.. adding the <a> tag, makes the header clickable to your forum list..

this also assumes that your forum is installed in the root of your website as your urls show above..