120x120 pixels max. Just upload it to Your Files and then you can select it from the drop-down menu on your main User Account page.
Oh, and use a format that isn't too freaky. GIF, JPEG/JPG and BMP, I think.
Edited, Mar 7th 2007 5:14pm by Mazra
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Please "talk up" if your comprehension white-shifts. I will use simple-happy language-words to help you understand.