To create an email account with your domain please follow these steps:

1. Log into your hosting cPanel (YOURDOMAIN/cpanel).
2. Go to Email Accounts
3. Enter the email address that you wish to create in the Email text box. If you manage more than one domain, make certain to select the appropriate domain from the menu.
4. Enter and confirm the new password in the appropriate text boxes.
5. Select "unlimited" for the quota in the Mailbox Quota text box.
6. Click Create Account.

To check your email via webmail:

1. Click More for the appropriate email account.
2. Select Access Webmail.
3. Enter the password in the appropriate text box.
4. Click Log in.

For more information view the documentation at https://documentation.cpanel.net/display/ALD/Email+Accounts#.