Understand that the blade has edges, both outside and inside. This stop must be done on the flat of the blade (the very center of the blade).
Practice at the rail. Push the flat of the blade out to scrape the ice while holding onto the rail.
Move away from the rail and slowly glide on two feet.
Push one foot out by pressing on a flat. There should be some friction on the ice and snow should form.
Come to a complete stop.