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If you would like, feel free to watch this tutorial in video form.
JailbreakMe 3.0 is one of the simplest jailbreaks ever. Unlike a typical jailbreak that requires you to enter DFU mode and download firmware to your computer, JailbreakMe 3.0 is a browser based jailbreak meaning that all you need is access to Wi-Fi or 3G on your iPhone, iPod touch or iPad. However as with all jailbreaks it is highly recommended that you connect your device to iTunes and let it sync to back up all of your data. You should not lose any data in the jailbreak but there’s always a chance that something could go wrong so by syncing you are covered.
On your iPhone, iPod touch or iPad open Safari and navigate to http://www.jailbreakme.com
Click on Free then Install just like you would install something from the App Store.
Now you should be sent to your homescreen. Scroll to the next page where you have free space for apps and let Cydia download and install. Once it has finished installing open the new Cydia icon.
At this point give your device a few minutes to let Cydia get set up and sync for the first time. Congratulations, you are now jailbroken!