Go to Start menu and search for Settings. Open the Settings App.

Select Network & Internet from the menu on the left and then click Wi-Fi on the right.
Select Manage known networks.
Click Forget button next to the Wi-Fi network you want to remove.
Go to Start menu and search for Settings. Open the Settings App.

Select Network & Internet from the menu on the left and then click Wi-Fi on the right.
Select Manage known networks.
Click Forget button next to the Wi-Fi network you want to remove.