Currently you need to install TestFlight on your IPhone. And I will need the email address associated with the Apple ID you will used in TestFlight so I can send you an invitation to the app. If you are experiencing difficulty with setting up TestFlight(lost access to email), you can set up a new apple id with a different email address(that is the email I will need to send the invite).
If the link doesn't work, send an email manually to neobiketrails@gmail.com