Is Einstein's Theory Forbidding Faster Than Light Travel or Exchange of Information?

Einstein's theory forbids faster than light travel or exchange of information. But we do have an arro of time in our universe, like we experience it. We can use this airo of time to say where you can only send information faster and light if it goes forward in time. And not backward in time, yes. You still have potentially problems with causality. They are scenarios that you can make up what would happen but those are fairly easy to get rid of just by saying, well, it can't happen.