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Ok if this is a newbb forum that is part of the XOOPS system you should be able to just activate it and set group permissions and have it show up.
However if this is a forum outside of the system, you should check out "imenu" ... I believe you can get it here in the downloads, if not check my site. Imenu is great you can add links to where ever youd like inside or outside of your xoops, or even on or off site.
My Site ->
HERE