1. Log in to the developer background of Yun Bei catering applet: you need to log in to the developer background of Yun Bei catering applet. You can find the login entrance of the developer backstage on the official website of Yun Bei Catering applet.

2. get the source code: in the developer background, you can find the source code file of Yun Bei catering applet. It can be directly modified online by downloading source code files or through developer tools.

3. modify the source code: after obtaining the source code, you can open the source code file and modify it. Before modifying the source code, it is best to back up the original file to prevent accidents.

4. Submit modification: After modification, you can submit the modified source code file to the developer background. Before submitting, you can preview the modified effect to ensure that everything goes as expected.

5. Review and release: After the modification is submitted, the Yun Bei catering applet will review the modification. After approval, the modification will be released to the Yun Bei catering applet.