Deleting a subdomain:
1. In control panel, navigate to Domains -> Subdomains.
2. When you roll down, you’ll see a list of the created subdomains. Click “Remove” from the right for the appropiate subdomain.
3. After clicking “Remove” the control panel will prompt you with a message: “Are you sure you wish to permanently delete [name of your subdomain]?” Click “Delete subdomain”.