Samsung UN40D6420UFXZA - Manual (Page 205)

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English
● 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. If the application can be locked, the Lock menu item
darkens.
3. Press the u / d / l / r to select Lock , and then press the ENTER E
button. The Security window appears.
4. Enter your password. If you have not created a password, enter “0-0-0-0”.
5. Press the ENTER E button. The Lock Service window appears confirming
the lock, and then closes. A lock symbol appears next to the application.