URL in signature line

I've seen a lot of people do this, but can't figure out how to make my website URL an active link in my signature.  Every time I try to put in the proper HTML tags, all of the brackets get stripped out.  Help!
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www.TiggerMan.com

Use square brackets, the start tag being url="someurl" and the closing one being /url

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Jeff - Webmaster/Admin - CoasterBuzz.com
"As far as I can tell it doesn't matter who you are. If you can believe, there's something worth fighting for..." - Garbage, "Parade"

This is a test of Jeff's directions.
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[a href="http://www.tiggerman.com"]www.TiggerMan.com[/a]

Testing again
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www.TiggerMan.com

Ugh... one more time.
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www.TiggerMan.com