Click the +GoogleCalendar button to open the calendar for editing.
Be sure to select "WhitPrint Studio Scheduling" when creating studio calendar events! Otherwise you'll simply add your event to your personal Google calendar and it won't show up on the shared WhitPrint calendar.
If you don't see a calendar above, you probably aren't logged into Google.
If you see a calendar with a message from email@example.com saying that you don't have permission to view events on it, you are probably logged into a Google account that is not the account you use for your WhitPrint membership. Or perhaps you are not a WhitPrint member.