To modify the commodity price calendar in Meituan B&B, you can follow the following steps:

1. Log in to Meituan B&B account.

2. Select the product to be changed and click the "Modify Price" button in the lower right corner.

3. in the pop-up price editing interface, drag the scroll bar on the right side of the calendar, select the time period to be changed, and then modify the commodity price.

4. click the "save" button after modification.

The above are the simple steps to modify the commodity price calendar in Meituan B&B, hoping to help you.