Go here - https://itch.io/jam/wowie-jam-3/entries . Now Click on any game you want to rate. Now you will find a 'Rate for Wowie Jam 3.0' on the top right of that game page. Click on that. You will be taken to a webpage. You will find 7 sections with 5 stars in each. According to each category, select the number of stars. Then Click 'Save rating' (Below those sections) and you are done!