I don't know which desktop either of you are using, but if you can, launch KNetworkManager. It is a system tray icon applet that allows you to select wired or wireless networks on the fly and select
how to attach to the wireless networks.
If your WiFi network has WEP or WPA, then you may need to change the password type.
You can use WEP passphrase, which is akin to plain text, WEP 40-bit/64-bit/128-bit hex/ASCII or WPA.
You just select the type in the drop down.
You can then save the password in KWallet. I use this for connecting at home (40bit WEP) and work (128-bit WPA).