Note: You may find support asking for an IP Address to attach the domain name. We use CNames to attach domain names because using IP Addresses means a systems servers must remain the same and ours do not and flux with incoming traffic and other updates. To ensure domain names always work, please use a cname to attach the domain to your site. 🙂
Have your custom domain name setup on Hostgator aka cpanel? Watch this video to learn how to do the Cname changes.