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Get one of those little icons under your name... I used to know how to do it but I haven't really visited any online forums in a while o.O :D And is there any way to run the HTML on in your sig. because I can't get the photo I hosted to show up in my sig.
At your profile screen, go to the bottom where it says Avatar Control Panel. The first bar is for a picture you have in your documents. If its online and image hosted, then copy the URL into the second bar. The picture must be equal to or less than 130x130 pixels and 25 mb.
Clickify 'submit.'
Also, it must be JPEG, GIF or something... it should tell you if there's an error and how to fix it. If the size isn't right, then just resize it.