If you operate a late book in the school, at some point in the day you will need to update the AM/PM attendance of the students to late.
Click the red Classes tab.
If you have a mix of students to update, spread across a number of years/classes, then you simply need to expand each class by clicking the '+' symbol and tick each student. Click the '-' symbol to collapse the list and continue to expand another class list.
Once you have selected all students, click Actions > Mark Attendance.
Only the students selected will appear in the mark attendance screen. Select the late code and apply it to the students. Click the clock symbol to set the total time they are late. E.g. 10min.