As of my last update, on platforms like FanDuel, once you have placed a bet, it generally cannot be changed or canceled. Betting sites typically have a strict policy that wagers are final once they are confirmed.

However, there are a few scenarios where you might be able to adjust your bet:

1. **Cash Out Options**: Some platforms offer a “Cash Out” feature that allows you to settle your bet early for a reduced payout. This feature is not available for all bets and is typically offered at the discretion of the sportsbook.

2. **In-Play Betting**: If you want to change your strategy mid-game, you can place additional bets while the event is in progress. This is known as live or in-play betting, but it does not alter your original bet.

3. **Parlay Insurance**: Some sportsbooks offer insurance on parlays where if one leg of your parlay loses, you can get your bet back (in the form of site credit or a free bet) under certain conditions.

It’s important to check the specific terms and conditions of FanDuel or any other sports betting platform you are using, as policies can change and may vary by jurisdiction. If you’re looking to change a bet, the best course of action is to check the platform’s help section or contact customer service for the most accurate and up-to-date information.