1. Visit https://play.google.com/apps/testing/com.contorra.golfpad and select to leave the testing program
2. Optionally leave the Golf Pad Beta Google Group at https://groups.google.com/forum/#!forum/golf-pad-beta
3. Uninstall the current version of Golf Pad and install it again from Google Play Store. Be sure to log in with a Golf Pad account before you uninstall and log in with the same account after reinstall, so that you playing history and statistics are preserved.
Use the link in email you received at the time you joined the beta program or select Stop Testing in Test Flight app on your phone.