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[img]URL[/img]
And replace "URL" with the URL of the gif. A gif is just a type of image, so it uses the regular image tags.
There are many programs for making gifs yourself if you want. However, I don't know much about the subject so I can't exactly recommend any of them.
2) Make sure it's under 50 MB.
3) Make sure it's under 728x100.