The one-yuan boost on Meituan is the Tustin Burger. The steps to place an order after the boost is successful are as follows:

1. Open the Meituan app and search for "Tustin Burger" on the homepage. Or select the "Burgers and Hot Dogs" category in the "Food" section and select the Tustin Burger location.

2. Select the product on the store page and add it to the shopping cart.

3. On the order confirmation page, choose to use the coupon and select the coupon you just obtained.

4. Confirm the order information and complete the payment to enjoy the discount.