How do you go on Dimension U and play it

First go on DimensionU.com. If you're not signed up yet, when you go to tis website, look on your top right corner where you will see Sign Up and Sign In, click sign up. If you are signed up, and you want to play the game there is a gray bar kinda like where you type your question here on this website. OK, anyway, on that gray bar it says games and click on it. You will see the first picture of the DimensionU video game, then click on the picture. Finally you can download it! But it can only download on laptops!