When the "To _ Points?" box pops up, type in one of the numbers provided and get ready to play. Player 1 uses W and S to move the paddle Player 2 uses the Up and Down arrows to move the paddle Press Space to pause the game Also, if the ball launches at a small angle, you can just press the flag and input the point range again to restart and get the preferred angle.
Give credit to the inventor of Pong. I only recreated the game with a few extra features. Update: April 4, 2017: I have added some code to make the launch angle of the ball less annoying.