That should be easy, if I get you right...
For example, in my
site
with a similar
wrapped forum
, I would use this code anywhere in the template (either through a menu or direct implant into the index.php or content):
http://www.joomlaspan.com/component/option,com_smf/Itemid,138/
Note that this is the link to the wrapped forum homepage. You will see it if you hover on the Forum link on the Top Menu.