If your device is not running Windows 8 or 8.1, refer to Windows 10.
From the right edge of the screen, swipe left to display the charms menu.
If using a mouse, move the pointer to the upper or lower-right corner of the Start screen then move up/down.
Alternatively, press the Windows+C keys ( +C) located on the physical keyboard (if available).
Tap or click Settings.
Tap or click Change PC settings (located in the lower-right).
From the left-pane, tap or click Network.
If not available, tap or click the left arrow icon (located in the upper-left) as necessary until "PC settings" appears in the upper-left.
From the Wi-Fi section, tap or click Manage known networks.
If not available, refer Microsoft's Manage wireless network profiles article and follow the instructions for "Show all wireless profiles on the PC" and "Delete a profile".