The steps are:
1. Chagne your DNS server settings at your registrars website to:
2. Login to your Sophio support account and find the option to 'upate store' - enter the new domain name and click update!
Here's a video you can watch that walks you through it - http://www.youtube.com/watch?v=ukXfLKxDCrY
How do I use a custom domain name with my Sophio web store?
How do I add a CNAME record at my registrar to point to my NexpartB2C store?
When your Sophio store was created, we create a record in our SOPHIO dns with your store name and...Managing your DNS and updating your store's domain name.
In order to take your store live and use your chosen domain name for your b2c store, you'll want...