First, be sure you have the bluetooth option, it is not standard equipment on your model. You should have a bluetooth indicator light above the F1 key if yours came equipped with bluetooth. There should be a key sequence marked for it on the keyboard. I believe it is Fn+F2 that will switch your bluetooth wireless on and off. Your wifi wireless switch is on the right above the headphone and microphone ports, (next to "Dell Wi-Fi Catcher" button.)
Firstly you need to make sure that whether your Bluetooth is properly installed and as far as the switch is concerned the check on you keyboard from F1 to F12 where you can see the Bluetooth icon. So all you need to do is just to press Fn key and then hold the exact Bluetooth activating key.