Sometimes you may need to modify marked attendance sheet due to certain reason. If you want to change or modify existing attendance sheet of employee you need to take help from Tabular mode of attendance. You can come up to this window by clicking this tag; File>Tabular Mode.
A simple window exists there in which you need to select division and name of employee including that date and click on there. After clicking choose status of attendance(Present/ Absent/Half Day etc.). After following preceded process you can successfully change or modify existing attendance of employee.