How does a teacher take attendance on the mobile app?

Log in to the mobile app using the details you entered following the link sent by your school administrator.
You will be presented with a home screen with your schedule for the day.
From this home screen or the timetable screen (centre most button at the bottom of the screen), view your timetable and select the class for which you would like to take attendance.
Students will be marked as 'Present' by default.
Mark relevant students as 'Late'.
When marking students as 'Absent', you will have the option to give the reason as 'In School' or 'Unknown'.
Once you have taken attendance for all students, you can 'save' the information.

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