Lol.
uhm, look at the top of the page, and click "Profile".
Then the first large blank box of white, with the word "Signature" beside it.
Rules
The maximum physical size is 75 pixels (height) by 400 pixels (width) for images.
The maximum size is 100kb.
No animations.
No more than 250 characters in a signature.
One image per signature.
No image or text that would not be allowed on the forum, that means no porn, nothing illegal, no commercial advertising and so on.
No more than three lines of text without an image and two lines of text with an image including blank lines.
No more than one quote consisting of no more than two quote boxes per signature.
What will happen if you break them
The first violation will result in the poster being referred to this topic and requested to remove the offending item in their signature themselves. If they refuse to do so a GM will remove the entire signature. If the poster offends again they will again be requested to remove the offending item and on refusal this time around their ability to use signatures will be removed for a specified period of time.