You have to enter your domain administration section located on your Domain Registrar's website.
You need your domain username and password.
The login details are issued when you register a domain name.

Once inside your Domain Admin area you will be able to alter the Domain Name Servers

Below are the DNS Details of Small Pond Servers :

Small Pond - General Server 1
Name Server Information (DNS):
Name Server 1 : ns1.smallpondhosting.com
IP : 65.254.60.98
Name Server 2 : ns2.smallpondhosting.com
IP : 65.254.60.99

Small Pond - General Server 2
Name Server Information (DNS):
Name Server 1 : ns1.smallpondserver.com
IP : 64.22.82.203
Name Server 2 : ns2.smallpondserver.com
IP : 64.22.82.204

Windows
Name Server Information (DNS):
ns201.realvaluehosting.com
IP : 74.86.150.16
ns202.realvaluehosting.com
IP : 74.86.150.17