Not actually the Netgear site but router's setup screens (stored within the router).
Once past login go to Wireless and Wireless Security. If you are using WEP, you should, preferably, switch to WPA TKIP PSK as this is simpler and safer.
If you want to stick with WEP you may find the passphrase is represented only by hexadecimal alphanumerics or asterisks. Copy and paste the alphanumeric to the wireless adapter's user interface (or set a new passphrase).