To chance your avatar, you need to be on a Student home page. If your default home page is Parent or Coach, follow the link to find instructions for opening your Student home page.
Click the avatar in the upper left. This will open the avatar selection window.
Navigate the selection window by clicking the circles on either side of the current avatar, or click the All avatars button at the top left, and use a scroll bar. The currently selected avatar will show up with a gray background. Click Save to keep the avatar. If you do not see the Save button try scrolling down or zooming out.
The avatar you select will now be shown in the bio!