How do we get on the beta app for iOS? I have the test flight app installed. Is that all we need to do and then wait for the next build?
If you've received the invitation to TestFlight and have installed it and accessed this app through at least one of your devices, then the next build that gets published will be available for this device. If you haven't accessed TestFlight right away, the build will not work on the device if you add it afterwards.