Ok so as dannyhajek I had the same problem, I installed a theme and it gabe me an error 500. So I followed ZGani and I changed the name on ftp and it went back to default theme and got my admin central back. Now how do I get that theme to work properly. And its not like its some random theme, its Suffusion which is quite popular.
I am sorry but I am really new to this, after I make this favicon, can you give me step by step instructions as to where do I paste it or how do I link it to my header.php? I am using filezilla by the way.