The beta tester program is invitation-only.
On iOS, we will send you an invite to TestFlight via email. Follow the directions in the email to install the beta app. If you haven't used the TestFlight app before, the directions will guide you to download and install TestFlight in App Store.
On Android, please send us a request to join our beta tester program via email (firstname.lastname@example.org). The Android OS is owned by Google, which requires the user to have a Gmail (@gmail.com) or Google Apps account to participate in the beta program.