First, you need to know the Hostgator DNS that you need change your domain to. The welcome email you received from Hostgator provides you those name servers. Your name servers should look something like…
Take note of these two settings and login to your domain name registration account. Next, simply browse to the domain name settings area, select the domain name that you wish to update, unlock it, and set the name servers to the custom settings above.
Note: Whenever DNS (domain name server) change occurs, it requires around twenty four to forty eight hours for completing. During this proprogation time routers all over the world are updating their cache. This causes your site to be up and down randomly during the first 48 hours for different people at different times.