Samsung PN43D430A3DXZA - Manual (Page 76)

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5. If the Enter Security key screen appears, go to step 6. If you selected an AP or
wireless router that does not have security, go to step 8.
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 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.