You are right about lack of proper documentation. We asked for it, but Corona got in the way.
The ID method was the initial one. We then added the “VST Transit” way to simplify it. I think that’s ok, it’s obvious that you log in at the top right, get presented a “search” page immediately and then double-click the friends name, seems not so hard. Admittedly, if that fails, and the ID method is recommended, it’s a bit harder, but then that is covered in the manual and several posts here.
We are also planning a new UI altogether which - of course, along with better documentation - should make things even simpler. It just takes time and resources are limited, sorry for that. At least said link should provide every known information whatsoever.