If you have bought your domain and hosting from hostgator, that is ideal but at times you end up buying a domain from one service provider and want to host is on another one.
I am just going to give you a brief on how to point your pairNIC domain to Hostgator.
You must have received 1st and 2nd nameserver URLs from Hostgator.
Log into your pairNIC account.
Click on “Manage Domain Names” and select the domain you would like to edit.
Click on “E-mail Forwarding, Web Site Forwarding, and Custom DNS” and disable Custom DNS.
Now in the “Manage Domain Names” replace the ns3 and ns4 URLs with the nameserver URLs by Hostgator.
Press submit and your changes will be reflected within 48 hours.