Generally topics like this should go in the "Technical help" section, but since it isn't asked everday I'll help ya out.
Click on "Profile" at the top of the screen. Where is says "Signature:
This is a block of text that can be added to posts you make. There is a 600 character limit" put your image link in there enclosed in the img tags
Code:
[img]your link here[/img]
Hope this helps.
Posted the same minute.
