Suggestion to set up free unique email in big rock domain registration

Following were some important steps to set up free unique email in big rock domain registration.
Step 1. Activate The email service.
. Enter to the free email service interface.
. select to the manage email link.
Step 2. Authorize the email server to Send/accept emails for your Domain Name.
. Change Domain Name's Name server.
. Change Domain Name's DNS Records.