1) When you order a reseller account, you get the ability to use a
custom name server. A custom name server is specific to your domain
name but uses the same DNS IPs as our DNS.
2) The reseller name servers are given to you in your
"Welcome/Setup Email"
3) Now, you need to go to YOUR domain registrar, login into the domain
manager and you need to create those nameservers, they are also sometimes
called hostnames. That will allow you to set up the IPs for the nameservers/hostnames.
4) Once you have created those nameserver/hostnames and assigned the
IPs to them, you can then change your domain over to use the
nameserver/hostnames.
If you are not familiar with how to set this up in domain manager, you can contact our support and provide your domain registrar log-in details and we will do it for you.