If you want to change your avatar, you can do it in the settings section.
Steps to change your avatar:
1. In the right-hand corner of the main page, place a mouse on your nickname and click on the “Settings” button.
2. In your settings choose the “General” section and press the “Update logo” button.
3. Then choose and download the desired from your PC.
4. Next, you need to crop it. Press the “Save changes…” button after cropping it, and “Save changes…” one more time as there two types of picture sizes used for your Team Avatar.
5. Congratulation! Your Avatar has been successfully updated.