To change your avatar, head to the 'My Details' page within your account settings. Once this page loads, you'll see an option to update your avatar:

When you click the 'Change' option, you'll have a box pop up:

From here you'll have the option to select any avatar you may have previously uploaded or using one of the cool avatars we've uploaded that represent the current best players on each team's roster, as well as some 'legend' avatars and team logos. You can also upload one of your own if you wish!
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To upload your own, hit the browse button, find the image you want to use and click 'Upload Avatar'. This will then save the image as your avatar.