1. Open the WeChat application on your mobile phone.

2. In the WeChat interface, click the search icon in the upper right corner.

3. Enter the commonly used abbreviations of your university in the search box, and add the keyword "confession wall".

4. WeChat will display the content related to your search, including official WeChat account and articles.

5. After finding the relevant official WeChat account, click Enter to follow the official WeChat account.

6. The official account of WeChat will provide the entrance to the advertisement wall in his article.

7. In each issue of WeChat official account, you can find the content and participation method of the advertisement wall.