Using Signatures

Hey guys, I'm probably just an idiot, but how are people using the signatures and having graghics displayed? Take alook at mine at the bottom, it just says: http://card.mygamercard.net/sig/Irongladiator.png it says that URL's are accepted (Which it is) and HTML's are not, now I've seen people have a mygamercard.com signature on here before....how are they doing it?

 

Nevermind I guess BBcode was they way to do it.....figured it out on my own....I'm so proud! hehehehe