1- You should try to get a score of 21. (Ace equal to 11 or 1 / J,Q,K equal to 10)
2- You should sum your result and decide if you ask for more cards pressing the "HIT" button or if you don't want to take the risk, you can keep these points pressing the "HOLD" button.
3- You will know if you win or lose when you press button "HOLD".
4- If you want to start the game again, you should press the "RESTART" button.