Go to the SCHEDULING tab > SETTINGS page.

The SET HOLIDAY/VACATION HOURS button is how a clinic can set special hours and these hours will override the default schedule. Below you can see what that page looks like, simply go to the correct week and adjust the hours by clicking and dragging to ADD or REMOVE any BLUE section. If it is blue then it is potentially available to book an appointment. 

You can also adjust the available hours via MANUAL INPUT. To use this feature change the view from Click and Drag to Manual Input on the top right of the calendar.

Once in MANUAL INPUT, you can enter the exact times that you would like to ADJUST or click DELETE to remove the entire slot.

Once done making changes, click SAVE SCHEDULE. MAKE SURE TO SAVE THE CHANGES ON EACH WEEK INDIVIDUALLY BEFORE MOVING ON TO THE NEXT WEEK THAT YOU WOULD LIKE TO ADJUST.