Use the arrows to move your paddle thing. You're the one on the right, you are trying to get the ball into the left side's goal (The entire side) This is just a test so it is not bug-free, tell me bugs, or don't I don't care I'm not fixing it :)
Not done so shut up with your stupid complaints and realize this is scratch, and making anything except just following the ball is difficult. Credit to whoever made pong, lets hope it's not Nintendo or ill have a lawsuit on my hands lol