D-Link DIR-455 User Manual page 82

Section 5 - Connecting to a Wireless Network
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.
D-Link DIR-455 User Manual 78