The nameservice record describes the ip address of a nameserver associated with a (your) domain.
This domain then has a reference to that record. Use 'Create/Change Nameservers' at our 'My Domains' for this.
The content of the nameserver describes the services you offer, and the corresponding ip addresses for these services (e.g. 'www.my-sample-domain.com' has the ip address '192.168.1.1').
In case you chose Joker.com as your free nameservice provider, please click on 'DNS' at 'My Domains' to find all the options you have.