Log in to your Account Manager.
Next to Domains, click Launch.
Click the domain name you want to use to register as your own nameserver.
In the Settings tab, click Manage next to Host Names.
Click Add Hostname.
Enter the hostname you want to register.
Enter the two unique IP addresses you want to add to the host. Nameservers need to be set to the same IP address you've set up for your domain.
Click Add.