Please help - need to unlink the title of the forum and the title of categories

[Lynne]

The first one is probably in your header template. This is from a default 3.6 template - delete the stuff in red:

<td align="$stylevar[left]"><a href="$vboptions[forumhome].php$session[sessionurl_q]"><img src="$stylevar[titleimage]" border="0" alt="$vboptions[bbtitle]" /></a></td>

The second is probably in your navbar template. Again, this is from a default 3.6 template - delete the stuff in red:

<td width="100%"><span class="navbar"><a href="$vboptions[forumhome].php$session[sessionurl_q]" accesskey="1">$vboptions[bbtitle]</a></span> $navbits[breadcrumb]</td>