This is the most straightforward method. It uses the p0sixspwn standalone tool (v1.0.8) for Windows or Mac.
Developed by the renowned hacker winocm, with contributions from iH8sn0w and SquiffyPwn, p0sixspwn is an untethered jailbreak. Ios 6.1.6 Jailbreak
Some users prefer Redsn0w for its consistency. You perform a jailbreak first by "pointing" Redsn0w to the older iOS 6.0 IPSW file. This is the most straightforward method
If you used a tethered method and your device boots to a black screen or the Apple logo loops: with contributions from iH8sn0w and SquiffyPwn