First choose if you want an iMAP or POP ACCOUNT, more info here

• You will need to create an account through your cPanel account first You can learn how to do that here
• Instead of "Hostingbay.com.au" for the domain name, you will use your domain name. 
• Username is your email address.
• Password is the password you created for your email account.
• After you have set up the account it is best to test it by sending yourself a well-done email :)