It's actually in your navbar template... The code controlling it looks like this:
HTML Code:
<if condition="$show['forumdesc']">
<table class="tborder" cellpadding="$stylevar[cellpadding]" cellspacing="$stylevar[cellspacing]" border="0" width="100%" align="center">
<tr>
<td class="alt1" width="100%"><strong>$foruminfo[title]</strong> <span class="smallfont">$foruminfo[description]</span></td>
</tr>
</table>
<br />
</if>
You can also include HTML in your forum description itself so you can adjust fonts and even add images as needed for specific forums. I went so far as to put an ESPN score tracker in mine:
http://www.juot.net/forums/forumdisplay.php?f=44
:up: