You need to have a icomoon account: https://icomoon.io/app/ For future steps, i recommande to import actual set of keyrune's icons in icomoon.
A model asking for "The glyphs in your SVG font were loaded. Use this font's metrics and metadata when exporting fonts?" will appear, click on "Yes".
🎉 Success, you have now all the keyrune's icons in your icomoon project. That will be useful for the next steps when we need to generate the font.