In your navbar tempalate do this
Find:
<!--<td class="vbmenu_control"><a href="$vboptions[forumhome].php?$session[sessionurl]">Home</a></td>-->
Replace with
<td class="vbmenu_control"><if condition="THIS_SCRIPT == 'adv_index'"><a href="$vboptions[bburl]?$session[sessionurl]"> Forums <else /> <a href="$vboptions[homeurl]?$session[sessionurl]"> Home </if></a></td>
this will give you a link to the forums on vBa pages
and a link to vBa on the forum pages