HOW I RATE:
First, I move my browser window to the 4 rating selections located directly underneath the product review (i.e., Very Helpful, Helpful, Somewhat Helpful, and Not Helpful). I then decide which of the four options is the most appropriate choice for the given review. Next, I move my cursor to the rating option I've decided to select. Finally, I click the selected rating option and wait for the page to reload so that I can confirm that my rating selection has successfully registered.
Feel free to borrow my rating formula, but you must credit me for it on your profile page. I realize my skillful execution of this formula makes it seem easy to use, but that's only because I've been using it to rate reviews for quite some time. So, if, at first, you have trouble applying it, don't be discouraged. It will become easier with practice and repeated usage.