Property of the script line: Inserts.
you can use drag-and-drop to add or remove dates
•If you wish to have repeating dates, that is same day-month pairs, every year, then use repeating dates instead.
To add a specific insertion date, select it in the calendar and click on the Add button (you can also use drag and drop). To delete a date, select it in the list, and click on Remove.
Note that the list will not accept duplicate dates, and that you can have, at most, 127 different dates for each Insert script line.