You can make changes to accommodation easily. If you want to make a change in accommodation, select accommodation available in the schedule view, between the two dates where you wish to make the change. You then press the Accommodation-button (see picture below) and the accommodation section comes up. Here you see all overnight stays, and can easily change the number of rooms, change room types, or delete rooms. When you have made the changes, don't forget to press Save & Close.
If you want to read more about adding accommodation, click here!