Need help with running Github scripts with Hassio

There is now a way to integrate the Ring Alarm System into Home Assistant.
Unfortunately, I am unable to get this to work.
The process involves running the author’s script on Github. See below:

I have Hassio running on RPi3. I use a Dell Laptop to make changes to my HA configuration. As you can tell, I am trying to learn, but don’t have the technical know-how.
I have installed the mosquito client add-on, and it appears I have MQTT running (as there is an icon on the botton of the left side panel), but it isn’t connected to anything.
Is there a way to “load” this script on my pi vs in the HA on my pi to make it work? If so, what are the steps to do so? (I tried copying the address to the Git-hub pull area of the add-on store. I tried downloading the files onto my desktop, then opening a node.js command prompt and typing: npm install mqtt async ring-alarm socket.io-client, but things swirled around but I believe it couldn’t find the right directory or something. Same thing after I placed the files onto my RPi using the Samba share.
The most technical accomplishment I have achieved so far in my 4 months using HA is having “hacked” my Roomba to get the BLID code in order to integrate it into HA. I felt like a boss after that one!
So, if you can provide any guidance / help as to how exactly I would be able to integrate the above integration into Hassio, I’d be most grateful.
Specific instructions and exact programs used / needed are much appreciated.
Thanks!
D