Samsung PN43D430A3DXZA - Manual (Page 71)

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3. The Network function searches for available wireless networks. When done, it
displays a list of the available networks.
4. In the list of networks, press the u or d button to select a network, and then
press the ENTER E button twice.
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If the wireless router is set to Hidden (Invisible), you have to select Add
Network and enter the correct Network Name (SSID) and Security key to
establish the connection.
5. If the Enter Security Key screen appears, go to step 6. If you select an
wireless router that does not have security, go to step 7.