How to jailbreak my iPhone 4S 6.1.3 off a Mac?

I have an iPhone 4S running off iOS 6.1.3 and I want to jailbreak it. I have a Mac laptop and have noticed some software can only be downloaded on Windows. I have tried RedSn0w and Evasi0n, but both either do not support iPhone 4S (they only support iPhone 4), or they do not support iOS 6.1.3. I really would rather not have to spend any money on this process. How can I jailbreak my iPhone? Id there a program better than others, preferably free?

Refer to the google or youtube and follow the stpes wisely.

There's no program at all

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