1. Log into your cPanel. Example: http://yourdomainname.com/cpanel
2. In the Mail section, click Email Accounts
   
3. In the fields provided, type the Email, Password, Password (again) and the Mailbox Quota you would like to assign to the mailbox. 
4. Kindly ensure your password strength is at least 55. Learn More.
5. Click on the Create Account button to create the mailbox.

 How to remove mail accounts

To delete an email account, simply click on the Delete button next on it. 

cPanel Video Tutorial: Manage the email accounts associated with your domain(s).