If the Wi-Fi status in the menu bar (located at top right side of screen) is not displayed, you can enable the function from the Network pane of System Preferences .

1. From the Apple Menu, choose System Preferences . Alternatively you can use Spotlight to search it.
   
    
2. Click Network from the System Preferences  window.
   
    
3. Select Wi-Fi in the list of available network connections and ensure the Show Wi-Fi status in Menu Bar box is ticked.