For this game you need to click the green flag and click single player because the multiplayer does not work. On settings you can choose how many people you want to play against (that includes yourself). To win you need to get rid of all of your cards. To change the color when you have the change color card you need to type the initial of the color so say you want the color to be blue so you type B.
Thank you to TNTsquirrel for the original project i really liked your idea of uno and i have never played uno before so thank you for making it so easy and simple but still staying true to the original uno card game.