Once you've selected 'Enable Recurring Events':
It will display event's occurrence in the calendar automatically. Choose the 'Interval Period' of an event to be taken place Every 1st, 2nd, 3rd, 4th or 5th week on any one day from Monday to Sunday. (Note : Make sure that the recurring day of your event is between the range of 'Event Start Date' and 'Event Last Date'.)