LG L55C User Manual page 100

Device Settings
PIN: Enter a PIN (at least of four digits) and tap Continue.
●
Then re-enter your PIN and tap OK.
Password: Enter a Password (at least of four characters) and
●
tap Continue. Then re-enter your Password and tap OK.
From then on, any time you wish to turn the phone on or unlock
the screen, you must draw your unlock pattern or enter the PIN
or Password to unlock the screen.
1. Press
screen lock.
2. Confirm the saved Pattern, or your PIN or Password.
3. Select Pattern, PIN, or Password.
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> > Settings > Location & security > Change