Solved How to set up chrome join plugin for multiple user use simutanously?

Is it possible to set up chrome join plugin for multiple user use simultaneously?

In recent 2 months, I installed join chrome plugin at my workplace. It drew my colleagues' attention. Every body installed join app and link to their own PC.
My colleague asked me if I can setup a PC for everybody use, so everyone can sent message to that computer to do some "big project". eg. "alarm, boss come!", " or Hey, Join, open login page play music!".
Current problem is it seemed unable to link chrome to several user at the same time, and join seemed unable to share one PC with others.

So, did anyone know any skill that can make chrome join plugin to link to multiple user or is there any alternative way?