It'll archive stories for you.
If you have no idea what you're doing then just download this zip and extract it in a nice friendly location like your desktop.
Otherwise clone the project, do an npm install, it's pretty standard.
If you're on windows just run run.cmd and follow the prompts.
If you're on linux then run the tool with node index.js or npm run start.
If you're running this in targeted mode or scrape mode with a skip list then you'll need to figure out the ID for the stories you wish to archive
This can be done simply by examining the story URL.
In this example URL:
https://fiction.live/stories/Depravity/ya9v6ZAGRYNnoT9ay/Chapter-7-The-Chapter-With-Horse-Cocks/EvqrzX67ry8KaTdpu
the story ID is
ya9v6ZAGRYNnoT9ay
(it's the alphanumeric text that follows the story title, but (if applicable) comes before the chapter title)