Let me show you through screenshots.
Forgetting a Wi-Fi Network
Now I have changed password for my network and I can't connect to it again but there is no option for forgetting the Wi-Fi network. I can only connect to my WiFi if I change my router's network name or forget the previous settings for this network.
So I followed these steps :-
There are many third party apps and software avalable to handle your Wi-Fi settings but I prefer doing it with this method. Easy easy and you don't need an additional software to forget a WiFi network settings. You can also remove other users from your Wifi using on your Windows and Android device.