Now that you've collected your current settings, you are ready to rock and roll...er...plug and unplug things.
The first thing to do is to power down the computers on your network, as well as any hubs, switches, or routers, and your cable or DSL modem. You might have to unplug the modem to turn it off because many of these devices don't come with power switches.
The port, or socket, for the Ethernet cable on the modem will probably be marked, logically enough, “Ethernet.” Ignore the USB socket, which you will also find on many broadband modems, unless you want to plug a USB printer, or other USB device you want to share, in to it.
If an Ethernet cable is plugged in to the back of the modem, unplug it.
Next, using ...