Changing Icons on the Services Page (Aqua Theme)

On my Services page I have icons displayed next to each service: please see — http://www.smithmedicalwriting.com/services-3/

The Aqua Theme has a large list of icons available: http://blueowlcreative.com/wp/aqua/elements/icons/

I am attempting to change the icons that I have now; but every time I change the “featured text title” in the Services Page, the icon does not appear. For example, if I change the text title to star, the icon does not appear.

I can only change the “featured text title” to any of the icons that are already there (i.e. pencil, download cloud, chart, heart or paint brush).

How do I change the icons to any of the listed icons on this Aqua Theme site link? http://blueowlcreative.com/wp/aqua/elements/icons/

Thanks!