1. Open Meituan App and log in.
2. Find and enter the page of the business you want to blacken in the homepage or search bar.
3. In the menu bar at the top of the merchant page, find and click the "Complaint" or "Report" option.
4. On the complaint or report page, select the appropriate reasons, such as poor service of merchants and quality problems of goods.
5. Provide relevant specific information and evidence, such as order number, problem description and relevant photos. To help the American delegation understand the problem.
6. Submit your complaint or report according to the instructions on the page.
Please note that the US Mission will verify the complaints and reports, but the specific handling methods and time may be different. In addition, blackmailing a merchant will only block the display of this merchant on your account and will not affect other users.
If you have other questions or need further help, it is recommended to contact Meituan customer service directly to get accurate and timely answers.