You can delete your account using the below steps . Please find the steps mentioned below to check/locate the Account Deletion button in the game-
1. Tap on the setting button on the lower right
2. Tap on the 'My Account' button
3. Tap on the 'Smurf ID Settings' button
4. Tap on the 'Delete Account' button
5. Tap on the 'Delete Permanentely' Button on the warning pop-up
6. The Account Delete confirmation pop-up appears
If that doesn't, please contact our Support channel.