D-Link DIR-600 User Manual page 58

Section 5 - Connecting to a Wireless Network
5. Enter the same security key or passphrase that is on your
router and click Connect. You can also connect by pushing
the WPS button on the router.
It may take 20-30 seconds to connect to the wireless network. If
the connection fails, please verify that the security settings are
correct. The key or passphrase must be exactly the same as on
the wireless router.
D-Link DIR-600 User Manual 54