A kill switch is for allowing your Wireless card to be in use for Internet Connectivity. In the glitch, as instructed, at the 8th second, turn the switch off and turn it back on when instructed to as well. The kill switch is usually located on the side of the laptop(an actual switch) or on a hotkey(Like mine, specified as F12 button). You can locate this button/switch when you see an icon with an Antenna and (( )) around the head of it. If you like further explanation, please ask.
F1~F12 shouldn't be associated with the ALT buttons. If your laptop actually does, please specify company name and model number? Usually it's just plain F1~F12 keys or F1~F12 keys associated with the FN button.