It is very easy to do. Click on "My account" to the bottom left of this page and then push the Edit tab. Your picture will be resized on upload. Pictures so far (need to be signed in to view).
make sure you pick the one you want, the first time! You only seem to get one chance.
I just changed mine. One problem. I changed it, but it did not look as if I had. That was because the old page was in the cache. Hit reload and you should see the new picture. If you still can't do it, let me know and I will try to help you.
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