To direct customers from an existing domain to your Quick Shopping Cart subdomain, you need to modify the zone records with your domain registrar.
Specifically, you must modify the "A" record, also called a host record, within your zone records. This record connects your domain name to your IP address, which allows a user to type in your domain name and access your Web files on the Internet. "A" records are the most common type of zone record.
Not all registrars allow you to modify these records. If your registrar does not allow you to modify your zone records, contact their customer support department for help.