ProjectArmy

Have you tried disabling the category-icons plugin? I think that’s what causes the error.

You add the code under Appearance > Editor > style.css

Just be careful not to delete any other code in there. To be safe, add it at the bottom.

home is a class of the body.

The correct CSS code should be this:

body.home{background: url('https://i1.wp.com/www.coreintentions.com/wp-content/uploads/2016/05/cropped-23-01.png?fit=250%2C70');}

I used your logo as an example. ??

You should probably check the correct prefix for the tables in your database. Once you know the correct prefix, open wp-config.php and update this variable $table_prefix.

Let me know if that helps. ??