TMB,
If you want a pic in your sig, first things first keep it on the small side. ie; 60x60 pixels or there abouts.
Go to your "USER CP" which is the blue button located on the top right of every page here. Once at your user cp, click on the "edit profile" tab and scroll down to the signature box.
There you have to enter your already hosted pics in the following format.
You must be registered for see images
I put an extra space inbetween the "H" and the "T" in http so the forum wouldnt recognize the script.
But when entered properly in your sig box you too can have a prariedog with a bazooka!!!
You must be registered for see images attach
Hope that helps out some, if not ask again and Ill try to confuse you more.