If a student is added to an attendance roster after attendance has been taken for the day, you can Add Attendance for New Students in the bottom right to add their name to today’s roster – otherwise, their name will not appear on the roster until tomorrow.
If a student only comes twice a week and you don’t want to mark him/her absent for the days in between, you can check the “X” to the left of their name to remove them from the roster for that day. Click Add Attendance for New Students to add their name back for the day.