There are many registars in the world with different panels, however we have provided a simplistic explaination of how to register your name servers.
You will have to login to your registrar and find the area where you can specify both of your custom name server addresses as well as where you can associate them with IP addresses on your VPS. Once found, use the next two IP addresses after your main IP and assign one of them to your NS1 and the other to your NS2. If you only have 2 IP addresthen use your primary (or main IP) and the other IP for your name servers. NS1 with your primary, the second IP with your NS2 or vice versa.
After adding these custom nameservers to your domain registrar control panel, it will take 24 to 48 hous for your domain to delegate authority to your DNS server. Once this has taken effect, your DNS server has control over the DNS records for the domains which use your custom name server addresses
PLEASE DO NOT USE THE WHM NAME SERVER TOOL FOR OFFICIAL USE.