Child nameservers are also known as private nameservers. You can create your child nameservers from your domain registrar control panel. You need to register and set the child nameserver for your domain to point the domain to your VPS/Dedicated Server. While you register the child nameservers at your domain registrar, you will require your domain's IP addresses and ns1.example.com and ns2.example.com.
ns1.example.com
ns2.example.com
If you have purchased the domain from Accuwebhosting.com, please refer to Set > Private Nameserver to set up your nameserver.