How to update the io6 for the iPhone through your laptop?

I have the iphone4 and it's telling me to update to the IO6. But how do you update through the your laptop. I don't remember my wi-fi password so someone told me to do it through my laptop and to connect to iTunes to update. I'm an idiot when it comes to technology, can someone tell me step by step how to do it?

Simply plug in your iPhone, open iTunes, click your iPhone on the left hand panel and hit 'check for updates''. Check these images.

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To update, open your Itunes application, connect your device, on the left hand side there will be your device name. Click it, then under the picture of your iPhone there will be two buttons, Restore and Update, click update, then agree to apples terms and conditions, and there you go!

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