This is an online sitebuilder for testing purpose. It's available for host provider to test the real situation before making decision on purchase.
When you reach to control panel, just find (RVSiteBuilder Icon) and hit it to get started website creating.
Tryout is for host provide to install to provide customers/users to test RVSitebuilder by their end before making purchase. So, it definitely contains some features disabled for security reason, but those all will be enabled in the real program.