To create a new storefront,
from the Account Summary on the My Account page, click the Create New Storefront button.
from the My Storefronts page, click the Create Another Storefront button.
Then provide the domain name for your new storefront and click Continue button.
Finally, click the YES - INSTALL button to start the storefront installation, which takes a few minutes.
Once installation is done, you will receive an email from your new storefront, containing the url, login and password you need to access and log into it.
Return to My Storefronts to view your storefronts. To access details, and continue setup, click the Manage option for the storefront.