To submit a rating or review for a game, access the game's description page by selecting the game. You can do this in the menu tab, click My Games and select a game.
After selecting the game, you will see "Rate“. If you want to like the game, tap the Happy Heart, and watch the animated hearts fly! And if you do not like the game, tap the Broken Heart, and watch is fall to pieces! You also can write a review for the game, scroll down until you see Write Review. Pressing Submit will finalize your review. Click More if you want to see all the reviews.