Samsung PN51E490B4FXZA - Manual (Page 72)

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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 wireless 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 ▲/▼/◄/►
buttons to select number/characters. Press ENTERE to enter the
characters.
N You can also enter numbers by pressing the number buttons.
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 ► button to move the cursor to Next , and then press
the ENTERE button.