You must add this DNS glue record to use you nameservers.

1. Log into WHM.
2. Navigate to the DNS Functions section.
3. Click on the Edit DNS Zone option.
4. Select the domain that you need to add the Records to.
5. Click the Edit button and wait for the page to load.
6. In the first blank, type ns1.
7. Skip the box with 14400, and go to the drop-down box.
8. In the drop-down box, select A. A new box will appear.
9. Erase the IP or hostname within the box.
10. Type in the IP address for the NS1 private nameserver.
11. In the second blank, type ns2.
12. Skip the box with 14400, and go to the drop-down box.
13. In the drop-down box, select A. A new box will appear.
14. Erase the IP or hostname within the box.
15. Type in the IP address for the NS2 private nameserver.
16. Scroll all the way down to the bottom of the page and click the Save button.

When you get to the last step, your A record entries should look similar to the following: