Signature image

Call me dumb, but I have no idea how to put in a nice signature image. On the "edit profile" page I have a text box "signature", what do i need to enter there? Something like ? And what are the restrictions for images (size, or whatever I can't think of atm)?

EDIT: I hope I posted the question to the right forum.

Here's my sig, contains an image and a URL:

http://pastebin.com/4xfDf33x

Thank you, that will help! <img src="smileys/smiley1.gif" border="0" align="middle" />

Just To Test My signature

Works!