Here are some tips on how to add Meal/Sleep hours to a shift.
In order for Meal/Sleep hours to be an option in Quick Shifts, the shift must be an overnight shift that is 8 hours or more. After designating the time for the shift, you will see the Meal/Sleep hours section under Quick Shifts.

When configuring Meals/Sleep Hours, it is important to note that if the Meals/Sleep Behavior setting (in Site Settings, see image below) is set to "Paid", these hours will be subtracted from the totals, but not from their pay, for purposes of calculating overtime status for the week, but they will still be paid for these hours. If the Meals Sleep Behavior setting is set to "Unpaid", these hours will be subtracted from the Caregiver Hours for the shift in all respects. The caregiver will not be paid for these hours, and they will not count towards overtime. The client's billing will be unaffected. For both settings: with concurrent shifts, enter the full (same) number of hours on each instance of the shift and it will be divided by the number of clients.