Follow these steps to clear the wifi network and password from your device:

1. Select Start menu in your taskbar at the bottom left of your screen.
2. Go to 'Settings' and then 'Network & Internet'.
3. Select 'WiFi' on the left menu, then select 'Manage known networks'.
4. Select the network you want to remove, then click 'Forget'.
5. Now, verify that you device is no longer log-in automatically to the removed network.

You may also delete a Wi-Fi network profile using the Windows Command Prompt or Power Shell:  Start the Command Prompt as administrator and type the following commands: