adding custom icons to use in theme

Hi

I want to add my own icons to use in icon lists, boxes, menu items and more.
Searching the documentation and forum, I understand this is only possible by creating and uploading a new icon-font.

When searching how to do this, I found either
1) This video (http://vimeo.com/channels/aviathemes/75743285) in which an iconfont manager is used – but I can’t find the manager in my theme settings (using ENFOLD 3.0.4)
OR
2) This code snippet to place in functions.php (I’m working with a child theme): https://kriesi.at/support/topic/change-standard-icon-doesnt-work-child-theme/ but it seems to replace specific icons while what I want is to add more icons, not replace existing ones.

Please advise. If I’m working with a child theme under ENFLOD 3.0.4 how can I import additional icons to be used in theme elements.

Thanks,
Sharon