How do I add an HTML code to my signature in a messageboard-style forum?

I want to add different HTML codes (like my Feedburner Animator) to my signature line in forums but every time I've tried it just shows the code and not the image. Can you explain how to do it?How do I add an HTML code to my signature in a messageboard-style forum?
Some forums prevent you from using HTML in the signature. It may however accept BB code?

What is the address? I'll try to help you! :)



- EDIT -

the BB Code would be: [img]your image url goes here[/img] but eBaums World uses a strict policy on signatures:

';Allow HTML BB Code No';

';Allow HTML No';

';Can Upload Images for Signature No';

';Allow Image BB Code No';

After having a little go myself it's just about impossible to do so - I tried a few little known security hacks but nothing :(



Sorry dude!