If possible, Porch Posts should be spaced evenly across the length of your porch. However, such ideal spacing doesn't always permit Porch Posts at either side of the steps. Newel Posts can be used here to provide the ending point for Rails.
Newel Posts are also used on either side at the bottom of steps to "catch" the Rails. And finally, when the distance between Porch Posts is fairly long, Newel Posts can be used to good advantage between pairs of Porch Posts. Such placement adds visual interest by interrupting the Balustrade with another decorative element.
Bottom area of your Newel Posts may be trimmed as necessary during installation to fit your job.