When you tap on an airport or VOR, the Options button appears, which then allows you to add the airport or VOR as a waypoint in your current flight plan. This does not seem to work for intersections, or am I doing something wrong?
When adding a waypoint as described above, sometimes the waypoint appears in the unintended order in the flight plan. In these cases, a better way to add a waypoint would be to touch the route line and drag it to the new waypoint. I have not been able to get the new waypoint to snap to an airport, VOR or intersection though. It would be helpful if it did this or if a menu popped up asking if the waypoint should be placed on a known nearby navigation waypoint.