Newsever Theme fa fa Youtube Logo Editing

Hey I was wondering if anyone could help me with editing the youtube logo on this page. The header in this theme doesn’t show up as CSS so I’m not quite sure how I would go about adding another icon next to it such as Twitch or Twitter, or replacing the current icon. When I go to the header.php file I don’t really see a way to edit it around like I would like, and I can edit the tags around the fafa youtube with adding extra CSS but changing it directly I am not sure how to do since the header does not show up on the page.

I have not done anything with moving the default php files around only some CSS editing so if someone could point me what I should be looking for or where the location is it would be greatly appreciated. I don’t have much experience with php files.

The page I need help with: [log in to see the link]