In order to make it to each new level, you always need to finish as one of the top three racers. Kick things off by pressing the Start button in the bottom right corner. The next screen will allow you to choose a color for the body, roof and bed of your vehicle.
Once you make your selection, press the Start button at the center of the bottom of the screen. You'll then see your vehicle on the race track, along with three others lined up beside you. When you're ready to kick off the race, press the Start button in the middle of the screen.
Start making your way around the track by using the arrow keys. Keep in mind that since the race is in Iceland, you'll be sliding all over the track!
Directions
Gas: Up
Steer Vehicle: Left/Right
Brake: Down