You can either download the single file import via the latest Github release or alternatively fetch Kf through its NPM package:

npm install --save kf-sass

Next simply import kf.scss as an import in your main SCSS/Sass file:

@import 'relative/path-to/kf.scss';

Alternative: Live playground

If you just want to play around before installing - you can use the live playground instead which preloads Kf in a live Sass.js environment.