We have made it as easy as possible to use this -
1. First, install F-Droid separately. You cannot get this from the Play Store, you need to download it from their website. Click on 'Download F-Droid' to download the APK, then install it.
2. Make sure you have a QR scanner app installed. Can be anything you want.
3. Start the QR scanner app, and go to this website :
Scan the QR code, it should give you a link. Click on this link to open F-Droid, it should now automatically install the repository for RetroArch.
NOTE: If you get stuck in an infinite loop where it keeps asking you to 'Add a Repository' even though you have just added it, then you might need to close your QR scanner app running in the background.
4. Now you should be able to search for 'RetroArch' and install it. From the F-Droid app, you should now be informed whenever an update to RetroArch is available. You can also configure F-Droid to inform you of this automatically and to install it automatically.
NOTE: You can get the link to our F-Droid page also by going to our 'Platforms' page. Go to Android, and click on 'F-Droid'.