Do you already own this, and you're wanting to write a review on the one you own? Or are you wanting to request this as an assignment?
If you want to review it and you already own it, just click on "Grab It" in the upper right hand corner, and go from there.
If you want to request it for an assignment, you will need to get into a class with a Mentor. Your Mentor will be able to request it for you for an assignment. (Since only people in classes with Mentors and Advanced Reviewers can request free items to review or do buy-out assignments.)
Hope this helps!