Deleting a subdomain:
1. In control panel, navigate to domains -> subdomains
2. Click ‘edit subdomain’. You will see a list of the created subdomain. Click ‘delete’ from the right for the appropiate subdomain.
3. After clicking ‘delete’ the control panel will prompt you with a message: ‘Are you sure you wish to permanently delete [name of your subdomain]?’ Click ‘Yes’.