A trifecta box bet is a type of wager in horse racing that allows bettors to select three horses to finish in first, second, and third place in any order. To place a trifecta box bet on your sports betting app, follow these steps:

1. Log in to your account on the app and navigate to the horse racing section.
2. Choose the race you want to bet on and select the trifecta box option.
3. Select the three horses you want to include in your bet.
4. Enter the amount you want to wager on the trifecta box bet.
5. Review your selections and confirm the bet.

It is important to note that a trifecta box bet is more expensive than a standard trifecta bet, as it covers all possible combinations of the three horses selected. As a result, the cost of a trifecta box bet can quickly add up, so be sure to carefully consider your selections and the associated costs before placing the bet.