Thread:TheAtlantisDragon/@comment-22439-20140909005303/@comment-5089372-20140909013735

You need to go to your profile page (select your name name in the upper right corner). Once there you should see  "edit avatar" below your current profile image (you may need to tap under the image to see the button), select it. Press "choose file" on the menu that comes up, then select "choose existing". That should take you to your photos, select the image you want, then select "save, I'm done" and that should be it.

The avatar image has a 500kb max, so remember that when selecting your image.