You first need to install a userscript manager as an addon on your browser (I would recommend Tampermonkey, but Greasemonkey will also work for firefox)
just go to addons/extentions and search for either one of those there. once that's installed, you can go back to the script thread and click on that link again and it will instead open up userscript page so you can install the script to your addon from there
once you've installed the script, you can go to the neopets page (rubbish dump, in this instance) and there will be a UI overlay you can configure/use to start the script
feel free to reach out if you have any questions![]()