Click the down-arrow on Schedule Type, select Monthly, select the option, then select the day of the month.

or

Select the option for the last day of the month (whether 28, 29, 30, or 31).

In Start Time, select the schedule’s starting time for the day.

In End Time, select the latest time in the day for the schedule to run.

To have the schedule start randomly during the selected time period, select the Randomly Dispatch check box.

Click Apply to save the change.