It is both fine to click on the buttons on the main menu and tip your phone left and right to switch between the buttons, than tap anywhere on the screen to go forward.
During the game,you can control your car also by tip your phone left and right. The goal here is try to avoid to hit the coming cars. The more cars you passed, the more score you get.Keep in mind,listen to the car sound carefully and you'll have an idea of where are coming cars' position.
Your highest five scores will be recorded and shown on the scoreboard.Good luck and have fun!!