I don't usually do this, but you sound so self righteous knocking him off his high horse.
(Actually that was a lie, I do do this all the time, I just want to point out the irony of what you said. The difference between my knocking at your post and your knocking at his post however, is that I knock at everyones' posts, not just yours. Aso note that while I used self-righteous in a derogatory manner, if you are indeed right, then it really isn't. Sounds like some sort of weird social conditioning to me, but that's a discussion for another topic.)
What is free will to you? I feel like you're saying it's the ability to choose right or wrong.
He clearly states:
"free will, its what makes us human"
"Free will is going agaisnt nature"
"Free will is what makes us able to change the world"
While he did clearly state what he thinks Free Will is, those things he stated are terribly ambiguous and unsupported, and in my opinion, wrong. For example, free will is not what makes us human, because it may be possible that animals have free will, and hence it is not a distinguishing characteristic of "human". Free will can't be "going against nature" if animals have free will, nor can it be if humans have free will, since humans are in fact, part of nature. The tendency to exclude humans from nature is simply that we produce many things which would typically not be found anywhere without us, but as we ourselves are a product of nature, our products are also of nature. If you say "oh I meant the group that includes all of nature except man and man-made things" it's still wrong, because animals may have free will, and they are part of nature. Free will is not what makes us able to change the world either, rather it would be the excersize of free will that would enable us to change the world. Free Will also may not be the only force that enables us to change the world.
Free Will is the ability to make a decision irrespective of all factors except for the desires of the mind making the decision. It is the ability to choose among any number of options, while not being forced into choosing any specific option. If I have some set of options, {1,2,3,...,n}, no matter what the conditions placed upon them I can pick any of them. That is how I would define free will. The consequences that arise from that definition are another matter, and the ability to go through with the decision is yet another. Just because I have the ability to pick quadruple majoring in mechanical, electrical, aerospace, and chemical engineering does not mean that I actually CAN quadruple major, or that the school will LET me quadruple major. Free Will is simply the ability to pick.
What makes us human is our ability to reason(or at least that's what separates us fro animals).
Not necessarily. Animals may also have reason. For example, a cougar may reason that it is beneficial to its belly to be stealthy while stalking its dinner, and a dog may reason that to get the ball that's stuck underneath a bush it needs to use its paw or push something small under it to get the ball out. To be a smartass, what makes us human is our genetic combination
We would still be changing the world in whatever pre-ordained way we were meant to.
What you quoted did not imply that anything was preordained, nor did you express how preordination is possible with free will.
None.