When you come to work by clicking "CLOCK IN" button.

Before you go for lunch by clicking "LUNCH OUT" button.

After lunch, you get back to work by clicking "LUNCH IN" button.

Before you go home by clicking "CLOCK OUT" button.

If you work OT by clicking "OT IN" and "OT OUT" buttons after you log out ("CLOCK OUT").

For part-time staff, they log in and log out by clicking "PART TIME CLOCK IN"  and "PART TIME CLOCK OUT" buttons.