Applications icons not showing

According to this article https://stackideas.com/docs/easysocial/administrators/templating/overriding-app-icons I can install custom icons. I looked in the directory that the article says where they should be and the stock icons are in the correct location. Yet only a generic CSS background color shows on the app directory. Most of the stock icons would be fine if they would show up, a few I would like to customize. I have not made the override directory yet as even the stock installed icons do not display. I could not find anywhere in the admin settings to change from CSS color blocks to png icons either.

Need help in turning on the png icons.

This is a staging site for upgrading the main live site from 1.4 ES to 2.0 ES