Windows® 10 - Forget Wi-Fi Connection
Notes:
- These instructions are for disconnecting and removing Wi-Fi credentials. Refer to Disconnect from a Wi-Fi Network to disconnect only.
- If your Windows operating system is unknown, refer to Determining Software Version - Windows.
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From the Home screen, navigate: Settings icon
(located in the lower-left) > Network & Internet.
If the Windows Settings options are not visible, tap or click the Settings Home icon 
(located in the upper-left) to go to the Settings home page.
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Tap or click Wi-Fi, then tap or click Manage known networks.
If not available, refer to Microsoft's Manage wireless network profiles article and follow the instructions for "Show all wireless profiles on the PC" and "Delete a profile".
- Tap or click the appropriate Wi-Fi network name.
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Tap or click Forget.
(located in the lower-left) > Network & Internet.
If the Windows Settings options are not visible, tap or click the Settings Home icon 
(located in the upper-left) to go to the Settings home page.
Related Topic: Add a Wi-Fi Network