Add a new classrom: click Classrooms icon and select "Add new classroom" from options menu:
Now fill out classrooms data:
1. Name: enter classroom name which will be visible inside timetables.
2. Location: enter the location of the classrooms building - like name of the city, or campus where the lectures are held.
Note: students filter timetables first by Location and then by Course. If your course lectures are held at different locations or cities you should enter location of the main campus building and then add notes to each lecture that is held off campus individualy!
Delete classroom: click Classrooms icon, then select classroom you want to delete and select "Delete selected classroom" from options menu: