Login to Name.Com, view your domain list. Click the domain you would like that you wish to register the name server IPs with. Then click Manage Name Servers on the right. Place the information and click register. Now you can use those name servers for that domain or others. You can change the name servers of a domain by doing the same steps but clicking edit name servers. Hope that helps.
how much time will take with name to update the namesever
Nowadays, the name servers propagate in a couple of hours but it is ok to allow a couple more hours. Anyways you can check what name servers are assigned to your domain and what the A record is by using the website http://intodns.com/
Just enter your domain name and it will list the details.
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