Appointments+ and Google Calendar

Hi there,

Could someone possibly point me in the direction of instructions on how to get the google calendar working with this plugin?

I have found this video: http://www.youtube.com/watch?v=hul60oJ1Eiw

but I don't see how to get the 'google calendar' tab working in the app in the first place. Is there a setting I have missed?

Thank you!