Trying to jailbreak iphone 4s using I. O. S. 6.1.3?

I'm using Redsn0w trying to jailbreak my iphone 4s. It's using ios 6.1.3 but it won't let me jailbreak it. It keeps saying "Sorry, this isn't available on the iphone 4s yeat." Help.

There's no JB on the iphone 4S with ios 6.1.3
6.1.2 was the last.
the next will be after ios 7 is released.

Redsn0w is telling you what you need to know. There's no jailbreak for the iPhone 4S on 6.1.3.