The help documents describe call park activation using a shortcode, then also a parking spot assignment. That made it a little too complicated for me, so I tried it without the specific locations. One parked call at a time is enough for our small system.
Works great.
Just pick the codes you want to tuse, we used *74 to park, and *75 to retrieve. The shortcode prorgamming looks like this:
*74 Parkcall
*75 Ridecall