It's right click, properties, settings, and then you should see a window with two displays, labeled '1' and '2'. 1 is your main (or your laptop's) display while two is whatever your laptop is outputting to. Click the '2' and click 'extend my desktop to this screen' and you desktop will be extended to your TV (you can move your mouse or drag anything over to you TV. Now just adjust it until it looks like...
You TV will be to where ever display '2' is in your settings. So if it's to the left of display one, you desktop will be extended to the left of your laptop's display.