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The NS record are DNS record that identifies the DNS nameserver.

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Query

For instance, if we want to known the nameserver of google , we can DNS query the NS record with nslookup and the following command:

nslookup -type=NS google.com

google.com      nameserver = ns2.google.com
google.com      nameserver = ns3.google.com
google.com      nameserver = ns4.google.com
google.com      nameserver = ns1.google.com

Update

The NS record are controlled by your registrar and they should provide you with a mean to update them.