How to create pop-up chatbox (Invision)

Basically, I want to make a pop-up chat box like this site:
http://www.outlawduelacademy.com/

I have also tried to follow his directions from here:
http://help.forumotion.com/t122264-how-do-i-make-a-pop-up-chatbox#813120

Those directions did not help. I wonder if it is because i'm using Invision. In anycase, I thought it's better that I just make my own post so that someone can explain step by step on how to do this. I'm not very familiar with widgets either. When I tried making the widget from the directions, the widget didn't even show up.

Any help would be greatly appreciated.

My website:
http://honorguard.guildmmorpg.com/

You could try this chat:

http://www.avacweb.com/t532-avacweb-chat

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