1. Log in to www mobile-calendar.com
2. After logging in, you are in the user panel.
3. In the middle of the screen all your rooms are visible.
4. Click on the name of the room you want to deactivate/extinguish.
5. Check 'Room inactive' and then click 'Save changes'.
6. From now it is not possible to add a reservation to the room. This is especially useful in case of lack of possibility to book a room.