Remember that not every member of staff can see the diary from the SIMS homepage - but it's easy to add using the 'configure' button as described in the video.
Also remember to get the member of staff to login with their own SIMS user ID and password BEFORE you add the diary panel.
If a member of staff can't see the School Diary panel on the homepage they can always use the Focus | School | School Dairy menu route instead.