104D-Link DIR-518L User Manual
Section 6 - Connecting a Wireless Client
3.  The Wireless Network Connection box will appear. Enter the WPA-
PSK passphrase and click Connect.
It may take 20-30 seconds to connect to the wireless network. If the 
connection fails, please verify that the WPA-PSK settings are correct. 
The WPA-PSK passphrase must be exactly the same as on the wireless 
router.