Open "Substitution Planning" (in main menu on the left).
First you see the selected date.
Below you can select a different day within the next two weeks.
With the two arrows next to selected date you can jump two weeks forth and back.
With "today" button you jump back to todays date.
Days with open substituitions are highlighted orange.
Details see: Meaning of colors in date range
Below you see "all" absences of selected day on cards per teacher.
You can switch form view "all" to "ToDos". Then you only see absences which require a substitution.
"Open ToDos" shows only unsolved and unpublished substitutions.