D-Link Xtreme N Duo DAP-1522 User Manual page 82

Section 5 - Connecting to a Wireless Network
3. The Wireless Network Connection box will appear. Enter the same
WEP key that is on your access point and click Connect.
It may take 20-30 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 access point.
D-Link DAP-15 User Manual