Press the ON button at the backside of your tennis training machine, then once the green light turns on, press the button to adjust the spin setting and wind speed. To get started using this tennis training machine, all you have to do is press the button and the machine will automatically serve a ball. Yes, it is really as easy as 1-2-3 with this machine!  This is great for practicing your volley and more effectively hitting cross-court shots (side to side) and down-the-line shots (backhand). So, if you want to improve on your game, it's time you get this portable tennis ball machine in order to become the best.