First, you need to download the jailbreaker tool and the firmware that you will be using on your device. Secondly, connect your device to the computer and log in to iTunes then click on the type of phone that you are using. A window prompting you to turn off your phone will appear on the phones screen. Wait until the phones screen resets so as to have successfully jailbroken your device. Read more details at http://www.ehow.com/how_4889911_jailbreak-your-iphone.html.