Hi,
Please wrap pasted code within back ticks or highlight and hit the code button so that it displays the code snippets properly.
So how did you change the functions.php file if you dont know how to use ftp.
I would suggest you simply undo what you have done.
I would also suggest if you dont know how to use ftp, then Id be reluctant to fiddle with more advanced WordPress things. So you have a lot of learning to do or hiring someone to do what you need.
So its a simple answer. Look into and learn the "ftp thing" and learn more about WordPress to achieve what you want to do. Plenty tutorials online to help you out doing various things. Or simply pay someone to do it for you. Depends what you want to do with your time.