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Via the keyboard
Many laptops have a shortcut on the keyboard which allows you to enable and disable the Wi-Fi adaper, as quickly as possible, and some laptops have an indicator (small light) which blinks when the adapter is on.
If the Wi-Fi indicator doesn't blink, it is possible that you have accidentally disabled the wireless adapter while working on your laptop.
To enable the Wi-Fi adapter press and hold the Fn button and the Wi-Fi dedicated button (the button with a wireless-antenna icon).
Swipe down from the top of the screen with one finger and tap the icon in the top-right corner, or swipe down with two fingers to avoid the notification area (depends on the model number and manufacturer of the device)
Tap the Wi-Fi icon to enable or disable the Wi-Fi (on most devices, if the icon is colored white that means that the Wi-Fi is enabled, if it's grey, then it's disabled)
* The quick access menu's appearance is different from one device to another, but, the icons are the same as the ones shown below