Its already in theme. Why are u adding it? When you sent your first message in this topic, i thought you are a developer that searches solution for problem for your own theme. Normally FirmaSite have this solution in it. You dont need to put it when using FirmaSite.
Btw you shouldnt edit FirmaSite theme directly. I suggest you to use child-theme for keeping your changes while updating theme without worries: http://theme.firmasite.com/child-theme/