How to catch a dragon behind others?

The way the back dragon connects others is as follows:

Preparation materials: iphone 1 1? iOS 14.2

Wechat APP: 7.0. 18

1. After opening WeChat to enter, select WeChat group chat to enter.

2. Enter "# Cards" in the chat box.

3. Click "Solitaire Form".

4. Enter the Solitaire format and the first word, and click "Send".

5. Click "View Cards".

6. Click "+"to enter the Solitaire content.

7. Click "Send".