> http://windowsupdaterestored.com/en/aboutwindowsupdaterestor...
The submission is the literal website used for the updates. You use it by browsing the website like any other website.
You figured out how to use HN without much hand-holding, I'm sure you can figure out how to use this website as well :)
Edit: There is even a video explaining how to use the website, not sure what more you could ask for? https://www.youtube.com/watch?v=pbWa_tlC-3I
I was expecting one would need to tweak the registry or plug some custom DNS entries to get the updates running.