Samsung UN65D8000XFXZA - Manual (Page 214)

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English
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● Lock
The Lock function lets you lock some application in My Applications so they
can not be opened without entering the password.
To use the Lock function, follow these steps:
1. Press the { button on your remote.
2. Press the u / d / l / r to select an application, and then press the
ENTER E button.
3. Press the u / d / l / r to select Lock , and then press the ENTER E
button. The Security screen appears.
4. Enter your password. If you do not changed a password, enter “0-0-0-0”.
5. Press the ENTER E button. A confirming message screen appears. A lock
symbol appears next to the application.