You can change your name and avatar via the player profile in the settings. To do this, follow these steps: 

1. Tap "Player Profile" in the upper center of the main app screen. 

2. When you tap on the avatar, you can choose one from a compiled random selection. 

Note: You will see an avatar on the left and a name to the right. This is your current user information. 

3. To change your name you have to click on it, delete the current one and enter your desired player name. 

4. After that you confirm with "OK".