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I think you have to make a 100 pixel x 100 pixel max size or cropped size picture, *.jpg format worked for me. Then, you upload it. But I think the Website administrators here only announce and allow such avatar changes or uploads every once in awhile, maybe once monthly? There was a string recently announcing same, which is gone now. I found the upload very finicky. Accidentally picked the wrong picture, which set off "no can do" alarms. You can only guess what that one looked like.