As we will be unable to recover your account once it has been closed, we strongly recommend submitting a deletion request in only if you are absolutely sure you would like to close your account.
In the top-right corner of the website click on the Account section and select "Log In". Enter your credentials to log in; after that, you will find "Delete account" option in the menu.
On mobile, select “Account Deletion” in the Game Options > Legal section.