I can't change my background

I can't change the background to my forum: http://dmbempire.forumotion.com/

I would like to set it to this: http://fc06.deviantart.net/fs71/i/2013/012/1/1/the_jedi_order_by_guardianoftheforce-d5r24lm.jpg

but no matter what I try, nothing works

Hi,
Go to Display -> Pictures and Colors -> colors -> CSS Stylesheet
Find this link: http://fc04.deviantart.net/images/i/2002/26/9/1/Misconstrue_-_Image_1.jpg
Replace with: http://fc06.deviantart.net/fs71/i/2013/012/1/1/the_jedi_order_by_guardianoftheforce-d5r24lm.jpg
goodluck!

Save the image you've selected then upload it into an image uploader, I suggest you upload it in https://imgur.com , then next is copy the direct link, and paste it into
Display>Pics Management>Advance Mode>Background Picture(page)
your done..

I just tried both and nothing changed

Please post here the part you changed in your CSS stylesheet.  Please use the code tags.

/* Begin CSS for print media */
@media print {
    * {
    background-image: url(https://i.imgur.com/YqRntff.jpg?1);
        background-attachment: fixed;
    background-color: ;
    color: ;
    }


Sorry for the lack of code tags. This is like my 4th post on here.

This is not your forum's background:

Code:

/* Begin CSS for print media */
@media print {
    * {
    background-image: url(http://i.imgur.com/YqRntff.jpg?1);
        background-attachment: fixed;
    background-color: ;
    color: ;
    }

I know, that was me trying to change it and nothing happened.

Edit: wait hang on a second

Edit 2: Never mind, I found it. Thank you for the help, even if it was just me looking in the wrong place lol.