How do I send a waypoint to my Navigon or TomTom app?

The easiest way is probably to "touch" your waypoint on the map. Now hit the little blue button on the right side of the appearing box. A new screen will slide in, showing the details of the waypoint, scroll down a little and use the "Route to Point" button.

As an alternative, open "Settings / Waypoints / Your waypoint" and again you will see the detail screen for this WP.