To set up a personal nameserver, perform the following steps:
Navigate to the Nameservers section of the Basic cPanel & WHM Setup interface (Home >> Server Configuration >> Basic cPanel & WHM Setup)
Add your nameservers in the available text boxes.
Click Assign IP Address next to each nameserver to assign it an IP address.
Click Add an A entry for this nameserver to allow each nameserver to resolve through DNS.
Click Nameserver Selection under Service Configuration to enable the nameservers