If you are a reseller all your client domains should point to your default name servers provided in our welcome email.

However, If you own Private Name servers like ns1.yourdomain.com and ns2.yourdomain.com you can point your client domains to your private name servers.

You can purchase private name servers from http://www.fastwebhost.com/addon.html

Please make sure that your private name servers have propagated and are working before assigning to your client domains.

You can always use either our default name servers or your private name servers.