1. Login to the cPanel (http://yourdomain.com/cpanel or http://yourdomain.com:2082)
2. Under "Mail", click 'Email Accounts'
3. Type the email address need to be created in 'Email' field
4. Key in the password into 'Password' and 'Password (again)' field
* You can click 'Password generator' link to have a strong passwod
5. Type the quota into 'Mailbox quota' field
6. Click 'Create Account'