Ok I know this is quite a stupid question but how do I review? Every time I try to review it does not show up as a review. I have tried clicking the button at the bottom but it still doesn't work.
The problem may be that your reviews aren't long enough - in order for it to be counted as a review, it has to be over 250 characters. So even if you're making sure that the 'Is this a review?' box is set to 'Yes', if you're not hitting that 250 characters it won't get marked as a review. This is explained in the FAQ for New Users
Don't say you don't have enough time. You have exactly the same number of hours per day that were given to Helen Keller, Pasteur, Michaelangelo, Mother Teresa, Leonardo da Vinci, Thomas Jefferson, and Albert Einstein. — H. Jackson Brown