D-Link DIR-400 User Manual page 75

Section 5 - Connecting to a Wireless Network
3. The Wireless Network Connection box will appear.
Enter the same WEP key that is on your router and click
Connect.
It may take 0-30 seconds to connect to the wireless network.
If the connection fails, please verify that the WEP settings are
correct. The WEP key must be exactly the same as on the
wireless router.
D-Link DIR-400 User Manual 75