D-Link GO-RTW-N300 User Manual page 85

Section 3 - Connecting a Wireless Client
3. Enter the same security key or passphrase that is on your router
and click Connect.
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 GO-RTW-N300 User Manual 81