How to hyperlink from signature?

I wanted to link from my signature to the new sticky in Programming Questions, so I created it like this here in a post and copy/pasted the html into my signature.

It worked in signature preview but not once the new signature was saved.

For now I've made it look like this http://forum.arduino.cc/index.php?topic=384198.0 which looks ugly and anyway isn't a link.

I'm sure I've seen proper links from signatures: anybody care to share how to do that?

Due to persistent abuse, moderators tiring of fighting childish battles, and some limitations in the forum software, the rules regarding signatures were dramatically tightened. Working links were grandfathered.

In other words, a few idiots ruined it for everyone.

Ah well....