Samsung UN46ES7500F E-Manual page 246

Depending on the application, this
N
function may not be supported.
To use the Unlock function, follow these
steps:
1. Select an application, and then open the
Tools menu using your remote.
2. Select Unlock. The Security window
appears.
3. Enter your password using your remote.
If you do not changed a password, enter
"0-0-0-0".
4. A confirming message screen appears. A
lock symbol disappears.