Godaddy is who you need to contact they will be able to switch it back it happened to me before. As long as you supply them with as much detail as you can as to what you did it should be easy to fix.
If you want to dispaly a slider on your home page that is not “static” then you must go to your admin panel at the back end of your site. From there click on Apperence then Editor. Once you have clicked on editor find a file that says header.php . Then you can insert your html into that feild and it will show up on the home page.
