Does Zhilian need to take the initiative to add after changing WeChat?

Personally, I think it's ok to exchange WeChat with HR, but you should first indicate that you want his contact information, instead of directly asking the other party for WeChat contact information, which is more formal. Generally speaking, human resources prefer telephone communication to text chat on WeChat. If the other party is willing to call you, you can continue to ask if the other party can exchange WeChat.