The specific operation is as follows:
1. Open WeChat and enter the applet function on the discovery page.
2. Search to find the McDonald's applet, and click Enter.
3. After entering the applet, click My Function Options.
4. In my page, you can find the function options of order query, and click Enter to query the order.
Please note that the specific operation steps may be different for different mobile phone systems and different activities of McDonald's. If you can't find the corresponding order information, it is suggested to query directly in McDonald's applet or contact McDonald's customer service staff.