First of all, just in case you are asking What are nameservers? Now that is out of the way.
When creating private nameservers, you must register at least two.
To register private nameservers with Networksolutions.com, log in to your customer account and follow this guide.
1. Click on ‘Manage Host Servers’.
2. Enter the name server to be created and click ‘Continue’.
3. Confirm your IP address (or enter it if it is missing) and click ‘Continue’.
5. Click ‘Apply Change’ to create the new name server.
6. Repeat the above steps to create your second name server
Note: When creating private nameservers, it may take up to 72 hours for these to propagate throughout the internet.