1. From your Home screen, go to Settings > Wi-Fi
2. Turn on Wi-Fi.

For additional help, please consult Apple Support. 

1. Swipe down from the top of the screen.
2. Tap and hold Wi-Fi.
3. Turn on Use Wi-Fi.

For additional help, please consult Google Support. 

1. Open Control Panel.
2. Select Network and Internet or Network Connections.
3. Select View Network Status and Tasks or select the icon of the Wi-Fi adapter you want to enable.
4. Click Connect or Disconnect or click Enable.

For additional help, please consult Microsoft Support. 

You can enable and disable the Wi-Fi menu from the Network panel of System Preferences.

1. From the Apple menu, choose System Preferences.
2. Tap Network in the System Preferences window.
3. Select Wi-Fi in the list of available network connections.
4. Tap the option to Show Wi-Fi status in the menu bar.

For additional help, please consult Apple Support.

Note: If your connection is Not Secure, please update your OS to High Sierra or later or use a different device.