It is a much more convenient way to create new email accounts(boxes) from your hosting control panel. Please follow the steps below.
1. Login to your hosting control panel
2. Click on 'Emails'
3. Click the Manage Users & Quotas under the actions option. Then click the "Add email user" to create email account.
4. Fill the email username, password, first name and last name to create it. If you would like to set auto forwarding for your new created email account. You can set it as belew.