Open this page on the phone that will run Horizon’s Edge.
iPhone or iPad
Horizon’s Edge is coming to the App Store; ask Nathan for the TestFlight invite.
Then open Horizon’s Edge and type the sign-in code Nathan gave you.
Android
Horizon’s Edge comes from our own office server, not Google Play. Type the sign-in code Nathan gave you (it is not used up here; you type it again in the app).
Nathan can stop Horizon’s Edge on any phone at any time.