Where are you seeing them talking about buttons. Could they mean icons on the screen?
I would suspect you configure this like any other wireless router. You go into the wireless setting menu and set things like your ssid and keys and such and then configure your PC adapter to match.
I would try to avoid wep if you can it can be cracked in seconds. Most stuff will support WPA I would advise you use that rather than wep.
Never saw this router before they sure like to overcharge for the wireless upgrade. You can get a whole router for that cost.