Have a look at the original post to see the walkthrough, as it might be easier to understand; in combination with this video.
Same process as the original post, and here are the links to what you will need below:
TextWrangler (free) TextWrangler is a powerful, general-purpose text editor crafted in Bare Bones Software’s best traditions. For anyone who works with text, this award-winning application provides a clean, intelligent interface to a rich set of features for editing, searching, and manipulation of text with high performance. TextWrangler's best-of-class features include grep pattern matching, search and replace across multiple files, function navigation and syntax coloring for numerous source code languages, code folding, FTP and SFTP open and save, AppleScript, Mac OS X Unix scripting support, and much more.
config.json (free) file to configure Homebridge
You’ll also need to download an app from the AppStore called, “Devices”. It use to be free but now costs $2.99.
Thanks, and enjoy.