When you buy credits you a placing a combination of horse race wagers. You can see what types of bets – and the horse race you're betting on – by selecting "See Wager Details" on the purchase confirmation screen. You can also reshuffle the bets to choose a different selection by tapping "Reshuffle My Wagers." When you're ready to place your bet, click "Confirm Location & Wager." All wagers are final.