To customize your avatar, first click on your avatar on the top right of your screen, next to the notification and messages icons. This will bring down a drop down menu, and click on 'My Settings'.
When in "My Settings", click on the 'Avatars' tab which will give you the option to select which avatar you want to use.
No that will only allow to choose from pre selected icons. I was asking on how to upload your own custom avatar . But thanks anyways.
@katiatall you might want to voice your thoughts in this thread: