A system bet is made up of several combination and single bets. As soon as you have added at least 3 or more picks (up to 8) to the bet slip, you can place a system bet. To do so, click on the System  tab at the top of the bet slip. The number of possible system bets depends on the number of predicted outcomes.
If you select 'Insure 3', you will get your money back if your horse finishes second or third in the race. If you choose these 'Cash Back' bets, you will get a slightly reduced price, but the comfort of your money back if your horse does not win but runs 2nd or 2nd or 3rd.