No idea how to use this

That’s a bit harsh. The code is pretty simple, so it shouldn’t be too hard to figure out what it does and how it does it.

It still works fine for me – it does need a theme that supports the old sidebar widget system, though. Most newer themes use the Gutenberg/block based widgets.

Okay, so you are limiting this to only programmers who are willing to sort through your code. Got it. Seems like it would make more sense to.. at the VERY LEAST.. supply us with the information about the shortcode to activate it. Anyhow.. no matter I found something that was well documented and does what I need.

Not really ??
That was just a reply to your comment that you looked at the code.

Also there is no shortcode – it’s a sidebar widget, which is something different. So I guess I am limiting this to people who remember the old ways of customizing WordPress sites, which is probably fewer and fewer people every day.

I’m glad you found something that works for you!