If your asking if you can change your future, regardless of your knowledge on how it will turn out, then yes. I believe it is very possible to alter your life through intentions-manifestations.
If your asking, however, if once predicting your future, it is possible to use that knowledge to change the known events, I'm not quite sure.
I supposed you could view it as you either cant, know that you know. You can't, ever. You can now that you know. Or, You can always.
I think the only perspective that should be focused on is the last. Regardless of how much you know of your future, the present is a constant moving dot on your line of existence. By not only actions, but even thought, one can change the direction of their existence, or so I have found.
Please let me know if I misunderstood, or even if I was of any help.