Please be advised that once your bet is validated, it can no longer be cancelled, however, you will be able to cash-out your bet, whether or not you may always lose some amount bet.
You can check your bets by accessing to:
Computer: “Menu Account” (icon in your upper right corner) » "Account » My sports betting history » Settled bets / Unsettled bets”.
Mobile: Select "Account" Icon (icon in your upper right corner) » "History » Current betting slips / Betting slip history".