1. For pk in the live broadcast of WeChat video number, users need to ensure that the video number function has been enabled on WeChat account and the real-name authentication has been completed.

2. After entering the live broadcast room, you can click the "+"button in the lower right corner and select the "PK vs" function. Then, you can invite other users to participate in the pk war. Before the pk war begins, you can set the rules of pk war according to your own needs, such as fighting time, theme and so on.

3. Make sure that after the setup is completed, you can start inviting other users to join the battle. When all the participants are ready, you can click the "Start Fighting" button and officially start the pk war. In battle, you can show your talents, skills, opinions, etc. And interact with other participants.