How I can add more Fontello icons?

We use Fontello icon font generator, because you can customize icons on the http://www.fontello.com/. Just import to the website config.json from the ../includes/fontello/, customize icons and download new webfont.

Note. Do not delete icons what are included to your webfont.

Screenshot: http://screencast.com/t/U8dY8aye4u

About Fontello: http://www.wildli.com/blog/how-to-build-upon-past-fontello-icon-sets/