I worked it out:
0. Get to orbit - any orbit. For the ISS an orbit around Earth in the real solar system
1. Use burn node(s) to adjust Apo to 460 km, Peri to 370 km, and inclination to 51.6
2. Save location as ISSOrbit
3. Launch your satellite at that location
4. Save game
Looks like the best launch site to intercept the ISS would be the northern one
I worked it out:
0. Get to orbit - any orbit. For the ISS an orbit around Earth in the real solar system
1. Use burn node(s) to adjust Apo to 460 km, Peri to 370 km, and inclination to 51.6
2. Save location as ISSOrbit
3. Launch your satellite at that location
4. Save game
Looks like the best launch site to intercept the ISS would be the northern one