Hello, I added a background image to my html but it's not showing.

Here's what I put:
background-image:url('/desktop/background_image.jpg');

I named it "background_image" and it's a jpg.

What am I doing wrong?

Bring the image into the directory of your project like in a folder named images.
background-image:url('images/background_image.jpg');

How would I find that folder?

You need to create the folder, then put your images into it.
Please have a read through here:
http://www.coffeecup.com/help/articles/ … ml-editor/

The reason you are not getting them to work is because you need to reference the files "as if" they were on the web and right now they are pointed to a location on your own computer. When they are on the web they will not be in a desktop directory so:

1. Go to the location that your website files are located and see if there is already a folder called images.
2. If not, then create one there and put your images inside it.
3. If there is, then put your images inside it.

When you reference them then the location would be:
images/imagename.jpg or .png or ... You hopefully get the picture.

Hope that helps understand what is actually wrong.