I can't select (add) rooms in the iCalendar export configuration. What should I do?

1. Log in to your Google account:
https://accounts.google.com/

2. Click on the drawer button and select the Google Calendar application.

3. In the Google Calendar application, add your room calendar.

4. Initiate the iCalendar integration wizard on BedBooking and open it again (in order to refresh the list of available rooms).