These calendars are for information only. You can book the Murphy room or kitchen/dining/living rooms, using your own Google Calendar.
Bookings sometimes take a bit to make it onto the calendar. If you don't see a booking you created, wait a few minutes, refresh this page, and check again.
If you see blank calendars and an error message that says Events from one or more calendars could not be shown here because you do not have the permission to view them:
Open another tab in your browser.
Type Gmail.com in the address bar.
Log in to your Gmail account.
Come back to this page and refresh it.