First of all, just in case you are asking What are nameservers? Now that is out of the way.
To make DNS changes at Networksolutions.com, log in to your account and follow this guide.
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1. Select the domain you wish to change and click ‘Edit Contacts/Manage DNS’.
2. Select ‘Manage Name Servers’ and confirm by clicking ‘Go’.
3. Enter the new name servers in the Primary and Secondary fields and click ‘Continue’
4. You will be asked to check your changes and confirm them by clicking ‘Continue’
Note: You need to enter a minimum of 2 nameservers.
Warning: Do not enter your IP address; this will cause problems.
Remember, it can take up to 72 hours for the changes to take effect.