By clicking on the hexagonal figure at the top right of the screen, you will be redirected to your profile page.
You can modify your personal information such as your name, first name, nickname etc. by clicking on your name.
Select a new avatar that represents you by clicking on "Avatar & Badges" or directly on the image. Once selected, the avatar is automatically saved.
The rank section is unlocked when your account has reached level 10. These levels are visible on the hexagon or on the profile page.
The orange progress bar indicates your progress in the level.
By clicking on the character on the page, you can view the other characters. At the moment, the characters are not playable. This status will change in future updates.