How to edit a citation style? From European Journal of International Law to a bespoke style

The step-by-step guide says 'Download the style you want to edit to your computer, and open it in a (plain) text editor like Notepad on Windows'. But HOW exactly can we download it and open it? By pressing which button on which webpage can we do that? Sorry if this is the most obvious thing in the world to you but it is a complete mystery to me ... I would be so grateful for any help anyone can offer!
  • answered here: https://forums.zotero.org/discussion/61367/author-initials-before-last-name-in-first-author/#Item_3 (please don't double post; it gets confusing for everyone).
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