I was going into my FTP to edit my meta descriptions and keywords and such and before I even edited anything I downloaded the index.php file from the ftp to my desktop(I didn’t open it) I tried logging into my admin control panel on the website and this comes up:
"404 - Not Found
The page you are trying to access does not exist.
If this error persists, please contact the website webmaster.
If you are the webmaster of this site make sure that:
You have uploaded correctly your files to the public_html directory which is the web-root of your account;
You have not misspelled the URL. Bear in mind that letters are case sensitive and no blank spaces are recommended;
In case you have applied SEO - SEF URL rewrite rules, make sure you have renamed the htaccess.txt file to .htaccess. If there is already a non-empty .htaccess file, check it and make sure the necessary rules are uncommented."
Someone help please! 
Thanks