Apple Airport Cards - WEP Configuration
Aim of this article:
This article provides information for configuring the Airport or Airport Extreme card to connect to a Wireless access point, or Airport Base Station, using WPA encryption.
Configure the Airport Card:
Begin by turning the Airport card on.
Select Other to be presented with a settings window.
On the Closed Network screen enter the following:
Wireless Security: WEP Password (shown above) or WEP 40/128-bit hex (shown below)

Network Name: Enter the name you configured on your Base Station or Access point (also referred to as the SSID).
Password: Enter the WEP password or key you have configured on your Base Station or Access point.
Click OK. The connection should now be succesfully established.