Hello,
You don't need to confirm the first waypoint. The Enter key is used for a route with 2 waypoints minimum.
To add an second waypoint, you click on the "world map" key (up and left),

a tap on a waypoint, on map, and then a tap on "route" key, and after, at the end, to come back in route menu, you confirm with the green check (you can see the number of waypoints).

After, you write the name of the route and now, it is possible to save the route. (Enter key)

You can also add with a tap on the the "+star" key (on the right of the "world map" key.

Have a good sunday.
Jean-Pierre, LFFD.