Try this:
<a href=http://social.technet.microsoft.com/wiki/contents/articles/how-to-get-hyperlinks-in-your-microsoft-forum-signature.aspx>TechNet Wiki</a>
When it works corretly, you would see a hyperlink named "TechNet Wiki". My signature looks like this:
Ed Price a.k.a User Ed, Microsoft Experience Program Manager (Blog,Twitter, Wiki)
The question was originally asked by Jack Dahlgren and answered by Jim Aksel here: http://social.technet.microsoft.com/Forums/en-US/Profile/thread/f88480b3-3676-4b12-bde6-f420ecfba1d7 The Horizontal Rules and Font Style sections were added by Naomi N. This article is part of the Wiki series: MSDN/TechNet Forums.
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