totally understandable to be overwhelmed, i know you're just starting out! if it helps, you're more than welcome to use the code on the github as-is - literally just download the "warnings" folder, put the folder in your neocities, and then paste [explained below] inside the head tag at the top of whichever pages you want the warnings displayed on and it should work!
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oop neocities comments don't like code i guess. the thing to paste is in the "how to use" bit on the github page, you paste it into the head tag at the top of your html pages once you have the warnings folder on your site. but also no pressure, ok to stick with what you're comfortable with! good luck