How to terminate a cPanel account in WHM
1. Login to your WHM.
2. Click "Terminate an Account" under "Account Functions" in the left side menu.
3. Select the account you want to delete, you can also search by Domain name, or User name.
4. If you’d like to keep this account’s DNS Zone, tick the "Keep DNS Zone".
5. Do not continue unless you’re absolutely sure the account should be terminated and permanently deleted from your server. If everything is confirmed, click the "Terminate" button.