How to use the towbar with the Aerosoar Discus glider

I just downloaded The Aerosoar Discus glider.
Can anyone tell me how to get the tow plane or how to start already at altitude.
Thanks

Click on the map (not on an airport) to start at altitude

I’ve not actually tried any of the freeware gliders myself but there’s this external app which I think most use for glider towing and other things: Kinetic Assistant - TouchingCloud - Microsoft Flight Simulator! [OFFICIAL MOD PAGE]