How to Forget Wifi in Windows 10

To Forget Wi-fi Network in Windows 10.
1. Close/disconnect Wi-fi connection.
2. Click the Windows logo / Start Menu ,  or press Windows logo on the keyboard
3. Choose Settings.
4. Choose Network & internet.

5. Choose Change adapter options

6. Choose Wi-fi icon

7. Choose Manage Wi-fi settings

8. Scroll down to find the SSID/wi-fi name that you want to forget

9. Click on the SSID name , then click Forget

For Windows 10 with new updated. for step 7,8,9 are different :

7. Choose Manage known networks

8. Select the Wi-fi/ SSID that you want to forget from the list.

9. Click Forget.