Connect to a projector or PC

press the Windows logo key + P, and then choose one of the four options:

• PC screen only. You'll see everything on your PC. (When you're connected to a wireless projector, this option changes to Disconnect.)
  
• Duplicate. You'll see the same things on both screens.
  
• Extend. You'll see everything across both screens, and you can drag and move items between the two.
  
• Second screen only. You'll see everything on the connected screen. The other screen will be blank.
  

Then again, you might not even need a cable. If your PC and the projector both support Miracast, press the Windows logo key + P, select Connect to a wireless display, choose a projector, and you're set.