Similar to a combi bet, a system bet allows you to bet on multiple events with a single stake. Unlike combi bets, however, not all of the selections in a system bet have to be correct for the bet to win. For example, if you select 6 bets and choose a 3/6 system bet, only 3 of the 6 bets have to be correct for some winnings to be generated.
After selecting the bets you would like to include, simply choose the type of system bet you would like to place and enter your stake. The winnings will depend on the type of system bet you choose and how many of the individual bets are correct.