i can't figure out how to do it please help
Most Helpful Girl
Click on the "Account" botton to the right in the box with your username, profile pic, questions, answers etc.
And right to the left you can see already made pictures that you can chose from, just press "upload picture" and find it! :D
"The optimal icon size is 75x75 pixels, but any image in JPG, GIF, BMP or PNG format can be uploaded as long as your image is less than 1 Megabytes."1