Changing url of website

How do I change the url of the website in The Hub without having to remove/add in the website. The client didn't want to switch the domain over until (almost) everything was set up so I couldn't test/install/etc everything with the domain name, only the IP.

The website is ZenMommyOrganics.com

This is a very important feature for when clients want to set up a new website in a subdomain for them to review and approve before launching.