I don't know where to put this so I just put it here.
How do you put a picture in your signiture?
Use the same code you use for posting:
[img]http://www.yourserver.com/yourimage.jpg[/img]
Questions regarding the forum system belong in General Discussion.
But try to keep it to a 50 height by 600 width maximum (pixels), and you should be good to go.
I think that is the limit, even though mine is a little bit above 50 height.