|1.3 - What is a signature? How do I put a picture there? Are there any rules for it?
Along with username and avatar, signature is something to help you to define your personality on the forum. It may be a quote or some line, or a small picture.
To put a link in your signature, use the UBB code. You can also upload a picture, but it can't be higher than 60px and wider than 468px, and it shouldn't exceed 20Kb.
You must provide an English translation to a non-English text in your signature.