It's a great tool; I recommend using it locally. Unfortunately, I can't help with that as I have no knowledge of how Mac works. You can try following the instructions given by beaker007 If that doesn't work, another alternative is to use a server via a web browser. In the video, I used an extension based on Chromium, despite its practicality. In Safari, simply type "gitpod.io/#" before the URL, like this:

gitpod.io/#https://github.com/gamerbeaker007/splinterlands-statistic

Clicking the link downloads the dependencies automatically and provides a temporary URL for use. It has its pros and cons. Using Gitpod requires creating accounts on third-party services since it's not possible to create the account in a standard way with email and password. I use the tool locally on my Ubuntu, but I need Gitpod for a solution to a problem I have in generating posts.