You have 2 possibilities:
- move the waypoint directly on the screen.
- Make sure the route is loaded
- Long press the screen and select Manage route /Edit route mode
- Press any waypoint and hold it and move it.
- Edit the waypoint coordinates
- Make sure the route is loaded
- Long press the screen and select Manage route /Edit route mode
- Press the Edit button
- Press a waypoint
- Edit its coordinate
- Press Ok
- Press Open