Samsung UN65D8000XFXZA - Manual (Page 95)

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6. Enter the Security key (Security key or PIN).
N
When you enter the Security key (Security key or PIN), use the u / d / l /
r buttons on your remote to select number/characters. Press ENTER E to
enter the characters.
N
You can also enter numbers by pressing the number buttons on your
remote.
N
You should be able to find the Pass Phrase on one of the set up screens
you used to set up your router or modem.
7. When done, use the r button to move the cursor to Next , and then press the
ENTER E button.