If your device supports Touch ID and/or Face ID, and you have at least one fingerprint or facial ID stored, when you register the app you will be asked if want to use Touch ID or Face ID to log in and taken through the set up process.
If you already have the app registered then you can set up fingerprint or face sign in by selecting 'Menu' and within the 'Settings' sliding the Touch ID or Face ID switch to “ON” (iPhone), for Android users this toggle is called 'Biometrics'. The next time you open the app you will be able to sign in using your fingerprint or face.
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