That link you refer to that says Antionline.com, is underlined as links traditionally are, and changes color on mouseover. Both are industry standard means of identifying links.

What else should we put, a graphic that says 'click here for forum index'? It's the standard place to find the navigation/breadcrumb links on a vbulletin forum, and since that is the most popular forum software in use on the web, I would think many people are able to use it without difficulty.