Add a facebook icon without using widgets

I would like to post a little facebook icon next to where my twitter and rss icons are, rather than as a widget. I realize this may involve some coding. Which file would this be in, and would I be able to just copy the coding that was used for the twitte icon, but replace it with the facebook data?

My blog is at https://www.candacemarra.info. The theme I am using is called Karmela. It was free and has no support. I want to put the facebook icon just to the left of the rss and twitter icons in the upper right corner of the page.

Thanks.