When everything's loaded in you'll be presented with a pretty fractal landscape.
Go into the VIEW button underneath and click and you will be presented with another row of buttons with which you can zoom around here, there and everywhere.
To get to the race click on and drag the green helmet to one of the cities (the small white flag-type things) near to you and the race will load. While riding around, the usual left/right joystick movement will control you while pushing up will increase your charioteering power.
As you pull up alongside another chariot the view changes, pointing the joystick one way and a press of the fire button will make your chap whip in that direction and maybe kill off your enemy.
