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scroll down to signature and insert [ img ] direct http link [ / img ]
ignore the spacing because i cannot type that correctly without spaces (it'd disappear)
use imageshack or photobucket. for image shack, make sure to look for the "direct link" or just keep right clicking and "view image" until you get to the direct link. I think without an account, image shack is purposely making it a little hard to get the link