How to Jailbreak my iphone 4s with 6.1.3?

I have looked all over youtube, but it seems there's no way to download a jailbreak for iphone 4s with ios 6.1.3. Please help, i need it jailbroken today. A link to a video would be helpful.

Also, do I have to downgrade my iphone if no downloads exist? Is it worth it? I mostly just want cydia to download free apps.

You can't?

You can't