1. First enter the backstage management interface of the official account of Shanxi Campus Culture WeChat, and enter through the login portal of WeChat public platform.

2. Then in the background management interface, find the setting options and click.

3. Then, on the settings page, find the official account setting option of WeChat, and click.

4. Then on the "WeChat official account settings" page, find the avatar option and click.

5. Then on the "avatar" page, find the signature option and click.

6. Finally, in the signature text box, enter the signature and click the Save button.