How do I use a domain name I already own with HostGator?

If you already own a domain name, you just need to “point” it to your HostGator account. When you sign up for hosting, be sure to click the “I Already Own This Domain” tab at the top of the order form. After completing the form, you’ll need to point your domain’s DNS to your new hosting account.

If HostGator doesn’t email you instructions on how to do this, then you can use this support document to go through process.