First, open the Pictures button under 'My stuff'.
Then click 'Upload New Picture'. If you want to title it to tell it apart from other pictures you may upload in the future.
After your done with that, click 'browse'.
Then try and find the picture on the thing that pops up.
Once you find it, click it and then the 'open' button.
After that, you press the button that says 'upload new picture'
Then click on 'profile' under your stuff
Click on the thing under where you put in text that says 'Avatar Photo'
Click on the one you want and save changes.
Tada! You have a new profile pic. 
