The procedure to clock out for the day is nearly identical to clocking in for the day.  The biggest difference is that Harmoni disables the clock out button if you are currently on a job, as seen here:

When you are no longer on a job, the button will appear a bit brighter letting you know it is now enabled.  In order to clock out, simply tap this button:

As with clocking in, the button will show a spinning symbol after you tap it and you will then be notified in the upper-right corner whether the clock out attempt was successful.  Also upon successful clock out, the screen will automatically return to the ‘All Employees’ view for the next operator.