On the 'edit sig' page it says,

Allow Basic BB Code Yes
Allow Color BB Code Yes
Allow Size BB Code Yes
Allow Font BB Code Yes
Allow Alignment BB Code Yes
Allow List BB Code Yes
Allow Link BB Code Yes
Allow HTML Yes
Allow Image BB Code Yes
Allow Code BB Code Yes
Allow PHP BB Code Yes
Allow HTML BB Code Yes
Allow Quote BB Code Yes
Allow Smilies Yes
Can Upload Images for Signature Yes
Can Upload Animated GIF for Signature Yes



This is what I get when I try to put the button in...

<a href="http://www.twitter.com/Pegasus_pegs"><img src="http://twitter-badges.s3.amazonaws.com/follow_me-c.png" alt="Follow Pegasus_pegs on Twitter"/></a>

It might be that I am not allowed to post a button here at Psych Central anyway.

Thanks for your help.