1. Open the WeChat application. In the main interface of WeChat, click the "I" icon in the lower right corner to enter the personal center.

2. In the personal center page, you can see a series of options including "Expression". Click the "Expression" option to enter the expression library.

3. There is a search box at the top of the emoticon store page. Click on the search box and enter "nine turns of large intestine". The system will automatically match the related facial expressions, select and click the "Nine Turn Large Intestine" emoji.

4. On the emoticon package details page, you can see an "Add" button. Click this button to add the nine-turn large intestine expression pack to the WeChat expression library.

5. After adding, you can click the emoticon button in the chat interface, select the "Nine-turn large intestine" emoticon package and send it to the other party.