You have loaded the software that came with the WUSB12 USB adapter?
That should install a program that will manage the wireless connection. There should be an icon for the adapter in the tray on the lower right of your desktop screen. You can search of available networks and select the SSID that you programmed into your router. You then need to add the password that you set for the router. It should then remember those settings afterward. I hope this gets you working.