Samsung UN65D8000XFXZA - Manual (Page 201)

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3. On the next screen, enter a new password on the first line. Enter it again on
the second line to confirm.
4. The Changing Password Completed. message screen appears. Press the
ENTER E button or wait for the screen to close - about 5 seconds.
Remove from TV Account List : The Remove from TV Account List function
cancels all your current registered Service Accounts that you registered on the
Register Service Account screen.
Deactivate Account : The Deactivate Account function deactivates your
Smart TV ID and deletes it and all your account settings entirely from Smart
Hub .