How to get a package with nuget

Hi all, this is probably ridiculously simple, but… There’s a nuget package published to Github packages that I want to use. I can see all kinds of documentation on how to use Github to publish a package, but for the life of me, I can’t find anything about how to retrieve a nuget package from github using nuget. Like, what’s the url for adding github as a package source?

I took a wild guess, by reverse engineering the publishing instructions and tried, but when I search the repository from Visual Studio using that source, I don’t find any packages. So that’s wrong. Can anyone give this poor soul a hint?