Basically you choose your network type (WEP, WPA, etc), and enter your passphrase or WEP key, if any. The WiShield software handles converting a WEP key to a properly formatted hex array if WEP40 or WEP128 is your selected network type.
Of course, the ideal scenario we'd all like is the same one we have with our laptops. Just pick a network and enter the password -- the laptop figures out the network type and sends the password / wep_key in the appropriate format. The sooner we can get to that day, the better!

-s