How to let my TeXShop see new packages?

I am using TeXShop on macOS, where I want to use the package pgfornament. I downloaded the zip file from:
https://ctan.org/pkg/pgfornament?lang=en

From there I didn’t really know where to go, as it seemed from looking around that I need to put the .sty file in my (~/Library/texmf) which I can not find. I found the library by Go -> Home in the finder, but there I only have TeX folder. I found an article with similar problem: How do I add a .sty file to my MacTeX/TeXShop installation?
But the application made by Alan Munn in the first answer is not working anymore and I do not have access to the link he gave.

I have tried different ways to make it work, all failed expect for when I have my .tex file in the same folder with the .sty and the .pgf files. The problem with that, there are different sets of .pgf files and I won’t be able to access all at the same time, also I would have to repeat the process for each .tex I make (which I believe I can put it in a library for TexShop to always access).