Profile page:

You can access your Profile page from several places:

• Tap the gear icon (top right), then select "AVATARS".
• Tap the panel showing your avatar, nickname, and score (top left of the grid).
• Tap the Tournament icon (trophy icon at the top right), then tap the panel showing your avatar, nickname, and score.

Nickname:

On your Profile page, you can change the name that will be displayed to other players in Tournaments and during duels. Simply enter a nickname containing 2 to 15 characters in the designated field and confirm it.

Avatars:

At the start of the game, you have a basic selection of avatars (or images) to visually represent yourself.
As you progress in the game, especially through Tournaments, you can collect Avatar Tokens.
To select an avatar, you need to collect the required number of tokens, as indicated below the avatar. The higher you rank in Tournaments, the more Avatar Tokens you will earn.