How to integrate one on one user to user chat

Hi, i want all users to chat but one on one. How do i integrate [single_chat user_id=2] dynamically change user_id by using do_shortcode in templates. Also after integrating what shortcode should i put on the page. A simple step by step guide would help. I want when someone comes to a users page , he just click on a chat directly to that user as my site has many members. Don’t want a group option.This is an awesome plugging and i think you should build on it and continue to update it