Hello Venturestar,
Welcome to the Forum.
Firstly, please register your legal copy of SSE in your Profile in this Forum. This will give you access to all boards of SSE. If you have any queries about a mission, you must post your message in the 'Missions' board.
To briefly answer you question, every waypoint is designated by a green star. Sometimes you may not be able to see it on the chart on the top right corner, so you will have to zoom the chart to "full screen". The conning compass on the bottom left of your screen also gives you an idea as to the direction you must move towards as indicated by the white circle. The white dot should be inside the white circle and that would mean you are heading for the waypoint, but in a straight line. You will have to allow for obstructions along the route.
Regards
vin_sun