Copy an instance of this repo with the button on the top right corner of this page. This will create a clone of all the files listed here so that all your changes belong to you.
Modify index.html to change the location to your own room.
Modify the endpoint of location.href to the url of your choice.
This can be done using the online file editor in Github, or locally with the text editor of your choice.
Under the Settings tab, scroll down to Github Pages.
Select master as your branch, /root as the source.