In menu Main/School you can find a dialog for changing the bell times.
If you have different bells on some day, you need to select the period and click the checkbox, then click Edit:
A dialog appears where you can input the times for each day. The default time is displayed at a top, if you do not fill in, then the default time for this period is used.
So fill in just the times that are different comparing to other days.
This article was viewed 104060 times.54162 / 104060