In order to terminate a client’s account, access through WHM the Accounts Fuctions category and choose the Terminate an Account option:
At the following page in the Domains column we’ll see the details of each domain hosting package, the actual disk space, and the maximum hosting capacity of the hosting package to which this domain is associated.
Once the domain name is checked, click the Terminate button.
Please note: This action is not reversible! Terminatig a domain deletes from the WHM system the domain’s cPanel account, including all site files, all databases, all email accounts, and all subdomains!