Using the application is as simple as hitting the refresh button situated in the upper right-hand corner of the screen, and waiting for it to find all the available networks in your area. This can take quite awhile, depending on how many networks are close by.
Once you have the list, you can select your network (it's important not to select unfamiliar networks, as you could end up committing a crime) and check out its security. If you can see your password, it's probably a good idea to switch it up.
This version of the application supports the following modem models: Thomson, Blink, SpeedTouch, O2Wireless, Orange, INFINITUM, BigPond, Otenet, Bbox, DMAX, privat, DLink, Discus, eircom, FASTWEB-1, Alice, WLAN_, WLAN, JAZZTEL, YaCom, SKY, TECOM-AH4222, TECOM-AH4021, InfostradaWiFi, TN_private_, CYTA, InterCable, Axtel, and MegaRed.
Wifi Unlocker 2.0 is a tool that you shouldn't take lightly; although it's easy to use and can help you out with your own connection, the consequences of abusing its power could be pretty bad. You know what they say: use at your own risk.