How to jailbreak Iphone 6s plus 9.2.1?

Link please I can't find it

There currently is no 9.2.1 jailbreak.

9.3 got released today so the jailbreak should come very soon, this is what pangu and taig were waiting for. There's no 9.2.1 jailbreak currently but hold on a few days and there might be.

You'll brick your phone kid.

A jailbreak for iOS 9.2.1 has not yet been released. The most latest is iOS 9.1 and that just got released. And there's no way to go back to iOS 9.1 because Apple does not sign it anymore. Just wait on iOS 9.2.1 till the jailbreak comes out or update to iOS 9.3 which just came out and not get the jailbreak. Ok hope I helped!