Trying to add an icon on a page

Hi guys,

I haven’t opened my website and wordpress interface in a while. I’m currently trying to add an icon to one of my pages https://thais-breton.com/corporatevideos/.
The one which appears on the top left. And it’s not doing the same thing as the other icons even though I copied the codes of other icons. What am I doing wrong?
In Bold is the portion I’m trying to add. When I remove that portion everything is fine on the page.

[ Unreadable code block of way too many lines deleted ]