Where can I find it? Services >>> Select a Service >>> Edit >>> Schedule.
Tip: use extra events to add dates that are not in your regular schedule.
Adding a single day
Go to Services >>> Select a Service >>> Edit >>> Schedule >>> Add individual events and select a date and a time. Finally, click on "Add":
Keep in mind: clicking on the "This service only" checkbox before adding your new event, will cause it to only apply to the current service. If left unchecked, it will be applied to all services sharing the same schedule.
Adding a range of time
From the same area visited above, click on Date | Range. This will enable you to select a range of days:
Deleting individual events
As above, to delete any individual events, click the delete button from the event and it will be deleted. This action can't be undone.