Hi Fredd,
If you have this code "<span>"icon-edit"</span>", it probably means that you forget to add class on buttons (for exemple "btn btn-primary" for the edit button).
You can find every class you need in the video (bottom of the documentation you've linked in your message) around 5 minutes.
If it didn't work, or have any other question, don't hesitate to come back to us.
Good continuation,
Ness