Ok so this is a two-player game. Player 1 (the paddle on the left side) should use "w" and "s" to move up and down, w being up and s being down. Player 2 (the paddle on the right side) should use the arrow keys to move up and down. The more experienced person should use w and s because there was a glitch that I couldn't fix; I could only fix it partly. Because I could only fix it partly the left side is less smooth movement than the right side so keep that in mind. Also there is another glitch the ball might spin when caught on your paddle. Just move the paddle around and it will send it back. Lastly, I found the "boing" sound effect a little creepy so if you want to sleep well at night DON'T use sound.
Matthew helped me.