Samsung LT27A750ND-ZA - Manual (Page 85)

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English
4. In the list of networks, press the u or d button to select a network, and then
press the ENTER E button twice.
N
If the Access Point (AP) 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 selected an AP
that does not have security, go to step 8.