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Leiton, I can help.
Go to the thread "Not your Usual Furry Art" (or whatever it is... can't remember right now) > Open the file so that all that is on the page is the picture and white space > copy the URL > Go to Profile > Forum Profile
Scroll to the Signature portion and use [img ]http:~~~[/img ]
Don't put the spaces in. They're there so you can see the command.