While jailbreaking is a fairly simple process, it's relatively impossible for hardware running iOS 6.1.3 or above - so this guide won't be of any use to you unless you downgrade your OS first.

This guide will help you jailbreak iOS devices runinng anything 6.1.2 or below and 4.3.3 and above. It serves the following devices: iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5, iPad 2, iPad 3rd generation, iPad 4th generation, iPad mini, iPod touch 4th generation, and iPod touch 5th generation.