This gif: http://www.reactiongifs.com/wp-content/uploads/2013/06/supa-hot-fire.gif
Thanks guys 
As it stands, you can’t. It’s too large. The max avatar size is 200x200 pixels.
Ok I resized it to 200x200. But whenever I try to upload it, I get an error.
I used Resize animated GIF.
So what’s the error you get?
it said ‘500 Internal Server Error’
My guess is that it’s really something on your end not communicating with the server properly. I’ve had other people ask about uploading pics and avatars and getting the same message. When I tried it things worked ok. The web server logs don’t show anything.