Latest questions about "chat information"

Chatting does not work properly on my Samsung. On my Samsung telephone it works OK, but answers don't reach me in time on the tablet. This is annoying and confusing.

I would like to ask if someone downloads WeChat app and gets registered as a new user, is there an option that automatically can send a friend request at once to all its contacts on the phone which...

How do I check who is chatting with whom? Like I give my girlfriend address and find out who she is chatting with besides me?