How to jailbreak my iPhone 3GS? - 2

I want to do it safely

Added (1). Ok, so how do I use Evasi0n?

As long as its not running iOS 6.1.3 or later than you are good. If its running iOS 6.1.2 or earlier you can use the Evasi0n jailbreak to do it quick and simple, If its running something under iOS 6 (iOS 5 or lower) you can use redsn0w or absinthe to jailbreak it un-teathered. (There's no jailbreak for iOS 6.1.3 or later and will not be anther one until iOS 7 drops later this summer or fall.)

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