Here's how to lock YouTube with a passcode on LG Smart TV
Secure your YouTube app with a passcode to prevent strangers from using YouTube. Keep in mind that you need to remember the passcode for the app. Otherwise, you won't be able to access the app.

How To Lock YouTube With a Passcode
Press the 'Settings' button on the remote
Scroll down and select 'All Settings'
Select 'General'
Click on 'System', then select 'Safety'
Turn the passcode On
Select 'Application Locks'
Select YouTube

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