I see them driving all over the place and they put out a signup for beta testing the app/service, but noone I know has been accepted.

Like to hear some first hand experience too.

Where can one find this so called app? Or is this something sent directly to specific people? Waymo is supposedly in Alanta, but I cant find any details on how to use it. I would totally give it a try and do a video.

There is no app or service yet. It says readying for this year. The people that tried it are in the early rider program.