Go to http://www.getgsc.com/gsc/downloads/
and get the Windows (32 bit) - GSC Client Application v.1.00.

There is currently no 64 bit support for this app.

Once installed: log in and go to "Find a Voice Server" button on the Welcome screen.
if you don't see it go to help then Welcome Screen.

Voice Server Search: Type Leviticus in the third field, click search, click the server,
and then the "Join Selected" button