DNS records can be added via cPanel -> Zone Editor. In order to add A records for your nameservers you need to do the following:
- Login to WHM and click on Edit DNS Zone
- Scroll down below Add New Entries Below this Line
- In the first field enter ns1 and then choose the record to be A record via the drop down menu. A new field will show up and you need to enter the IP address of your first nameserver there. That IP will be provided by us.
- Do the same with your secondary nameserver and click Save.
You now have A entries added for your private nameservers and they will function properly. You can add other A records in the same way if you need to point a domain or subdomain to another server with different IP address.