These instructions are for disconnecting and removing Wi-Fi credentials. Refer to Disconnect from a Wi-Fi Network to disconnect only.
From the Windows desktop, navigate: Start > Settings icon > Network & Internet
Utilize the touchscreen (if available) or mouse to select on-screen options
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"