There are 2 ways to link your Appointment Calendar to Google Calendar.
1) Click the Appointments tab and open the individual calendar you want to sync. Press the Options dropdown button and select the bottom option, named 'Google Calendar'
2) Click the icon (next to the Appointment tab) to open the Appointment slider and use the calendar icon at the top to sync with Google Calendar
Please note: Revelation Pets syncs with Google Calendar once a day at 1:00am Greenwich Mean Time (GMT).