To participate within the TrackLabs beta program please send an invitation request via email towards firstname.lastname@example.org. Next you have to download the TestFlight App from the AppStore. This app is used by Apple to distribute and manage beta programs within the AppStore.
As soon as TestFlight is is installed on your device and your beta request is approved by us you will receive an email from TestFlight. Within this email you can accept the beta invitation and the TestFlight app will afterwards automatically start and you can download the newest beta release from TrackLabs.
Have fun! :)