You change the channel at the router, not the pc.
WiFi has channels, kind of like a CB radio.
The primary channels are 1,6,11, and you want a 5 channel seperation.
You can download ssider on your pc, wifi analyzer on android, or an app on iOS to view the wifi signals in your area. Out of the 3 choose the one with the lowest signal (anything bellow -85 db will not interfer with your signal).