Select number of horses racing, select horses you think are going to win, select a track then click Race!
Arrow key red = slow down arrow key green = speed up.
First select Number of horses to race, then select which ones you predict will win. If all the selected horses finish in the places that you picked, then you will increase your reputation. If your reputation gets high enough you will unlock new horses to race against. The number of horses, the number of horses racing, and the track will effect your rating will gain at the end of each race