Well,time for a quick tutorial... you extract the program from it's archive to a folder of your choice and run it. Then you tell it where your GP2 archive is, that is pretty straightforward (menu point is under "Settings"). Then you import the GP2 data...

... and look for the place where your race is, e.g. Slot 13

Open it with that yellow "AB" button, which should make it look like this

The option shown is for a 0-Stop-Race. If you want 1 stop, you should change it to an earlier lap, in my example, Lap 50. The other number shows on how much laps these stops will be divided. 4 Laps is normally good enough, if you have a 100 % 1-Stop strategy, you might consider adding some laps. After everything is to your liking, just export

After that there shouldn't be anymore troubles. Rarely it can happen that strategies don'T get taken over 100 %, but that would only mean that 1 or 2 cars are doing a stop more or less. That can easily be fixed by replaying your editorial process