[_ck_]

WordPress allows you to make links, go to manage->links under your control panel. Make the link /forums/ if that’s the path to your forums.

There are also wordpress plugins to make menu bars, optionally you could use that and put a few primary site links in there, including one to your forums.

Technically if you wanted to place a link more prominently under your pages section, you could actually create a page for the forums and then use the rewriterules in your .htaccess to redirect the user to the actual forums.