Ok, the custom islands are going to be the hardest thing for people to get used to I think. These are just blocks of php code, so it will take a bit of knowledge with PHP in order for these to work properly. If you wanted that exact same bit you would put this into the custom island editor

PHP Code

$body = <<<EOF
<a href="https://www.ubbcentral.com">UBBCentral Webseite</a>
<br>
<a href="https://www.ubbcentral.com/order.php?product=UBB.threads">Preise / Bestellen</a>
<br>
<a href="http://www.infopop.com/members/members.php">UBB-Central Members Area</a>
EOF;