Setting Up a Custom Domain
Your Magento Go store can be launched quickly without registering a domain. However, branding your store with a custom “dot com” address is considered by many to be the hallmark of an established business.
Before you can set up a custom domain, you must obtain the rights to the domain that you want to use through the registrar of your choice. Because domain licenses are sold on a subscription basis, you can pay for a single year, or more. After you have obtained the rights to the domain, follow these steps to complete the configuration for your store.
Adding a Custom URL