to add new nameservers
1.go to your WHM-> Server Configuration -> Basic cPanel & WHM Setup.
2. On the bottom of that page you can add new nameservers.
3.set the new nameserves and then click the button “ Add an A entry “ for each nameserver.
4. Go back to WHM Main -> DNS Functions -> Edit DNS Zone
5. if your name server is "ns10.domain.com", edit the DNS Zone for yourdomain.com, then add an "A" entry for the "ns10" pointing to the same IP assigned by the registrar.