Press the green flag icon to start the game, move the paddle to the ball and make the ball bounce, once you've mastered that start making goals for yourself like this one: first find a corner to protect, then move the paddle there and protect the corner. Enjoy the game!
If you want to make this project on your own you may have to look a few things up on google, I did that myself. and for some instructions ask me in the comments. P.S. this is my first project!