HELP: post signature; what am i doing wrong?

[Vistar]

my signature image doesn't show up. i dont know if i'm doing it right or not. i went to my account and went to edit signature and put this in the box:


http://usera.imagecave.com/vistar/vistartagcopy.jpg


after i saved and tested it out there was no image....just the code. could someone please help me?