On the Schedule tab set a Start Date, a Timezone, Repeats (Weekly or Monthly) and Every N Weeks or Months. For weekly, click the day buttons under Which Days (Mon to Fri are pre-selected); for monthly, choose specific dates or a pattern. At the bottom, Hours Intervals defines the calling windows (defaults 09:15 to 12:45 and 13:15 to 17:45) and the blue + button adds another interval.