Hi MarciaL,
Thanks for posting your question. I'm more than happy to help you. You'll need add the domain to your account as a parked domain or add-on domain. Once the domain is added to your account, you'll need to upload content (website files) into the root directory of your website. Here's a link that may help you out:
Parked versus Add-on Domains
If you need further assistance please feel free to contact us.
Thanks!
Tim S