If you can control what would happen next

What if you could change the future and going back to fix past mistakes? Possibilities could help us. Because things could fall in the right place and time to create the present, so why can't we go back and do it? So science, as a equation could block a few possibilities like flying in the air and have dragons and magic etc. So what if we could change the possibilities and make things our way. Comment about what you think!