LG K20 User Manual page 10

Registering fingerprints
You can register and save your fingerprint on the device to use
fingerprint identification.
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Tap Settings General Fingerprints & security
Fingerprints.
This feature is available when the screen lock is set.
- Lock the device with a Knock Code, pattern, PIN or password.
If the screen lock is not set, configure the lock screen by following
the on-screen instructions. See
2
Locate the Power/Lock key on the back of the device and gently
put your finger on it to register the fingerprint.
Gently press the Power/Lock key so that the sensor can recognize
your fingerprint. If you press the Power/Lock key with an excessive
force, the screen lock function may start or the screen may turn off.
Ensure that your fingertip covers the entire surface of the sensor
on the Power/Lock key.
Custom-designed Features
Setting a screen lock for details.
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