Registry nameserver records will point the nameservers for your domain name to a specific IP address; you are advising the registry to direct the traffic for your nameserver to its designated IP address. To create Registry Nameserver records please follow these steps:

Step 1.
Login to your Rebel account and click Domain Manager.

Step 2.
Click directly on your domain name to access the edit page.

Step 3.
Once you are on the edit page for that domain scroll down until you find Create Registry Nameserver Record and click Add Nameserver located below.

Step 4.
You will be required to enter a prefix such as DNS or NS. The DNS suffix will default to your root-domain name. In the Points To field you must enter the IP address that you want your name server to point to. Please note that .CA domains require two unique IP address per nameservers; for most other domains you can use the same IP for both nameservers.