Biometrics

To enable fingerprint (Touch ID) or facial recognition (Face ID) if your device supports it. Once you've logged into the app:

From the bottom right hand side of your screen, tap 'More', then 'My settings and details'
From here you'll see 'Login with Touch ID / Face ID' if you have a compatible Apple device or 'Use biometric verification' if you have a compatible Android device
Tap the relevant option you'd like to use and slide the toggle to the right to enable it.