In order to take your store live and use your chosen domain name for your b2c store, you'll want to go to your registrar and update the DNS of your domain to point to the following nameservers.
ns1.sophiosoft.com
ns2.sophiosoft.com
ns3.sophiosoft.com
ns4.sophiosoft.com
If you've registered your domain with Sophio, this may have already been done for you.
After you have pointed the domain to the Sophio namerservers, you can log in to your support account here and Sophio and update your store to use that domain name.
In addition, if you are currently hosting the email for the domain name on another provider, you'll want to provide Sophio with the MX records for that domain name and request via support ticket to update the DNS records with those MX records after you have updated your store's domain name.
