Click on Play. The next screen will ask you to choose a vehicle and a terrain, but you will only be allowed the two surrounded by an orange line in the beginning. The others will open as you complete levels. Click on the arrow button on the bottom right of the screen to continue. On the next screen, you can use your earned points to buy certain items for your car that will make it better. The amount of coins you have will be indicated at the bottom. Click the next right-facing arrow to continue.
Once the game begins, you must click or press on the paddle to the right with your mouse or finger. Alternatively, you can use the right arrow key on your keyboard. On the left, you can press on the break paddle to slow down or stop completely. On the top left corner is a fuel gauge, the faster you go the faster it runs out, and you need to pick up fuel cans on the way to get more of it. Collect as many coins as you can to buy more upgrades!