Click on the avatar in the top left of the screen in the main menu:
Click on the ⚙️ icon in the upper right corner of the avatar in the profile window:
Click on the “Name” column, enter it and confirm with the “Save and Close” button:
You can change your profile name every three days:
Please note: if your profile name violates app's rules, the administration may reset it — in this case it will change to “I Love WPC” and you will not be able to change it until 3 days after the reset.