You can do this one of two ways:
1. You can upload the background image to your skins/YOURSKIN/img directory and then in your skins/YOURSKIN/css/site.css file, change the image name in the #wrapper selector.
Quote:
#wrapper {
margin:0 auto;
background-color: #C7C7C7;
background-image: url('{$jrNingja_img_url}/wrapper_bckgrnd.png');
background-attachment: fixed;
background-position: left top;
background-size: initial;
background-repeat: repeat-x;
}
Note that if you've cloned the jrNingja skin, then the$ jrNingja_img_url variable will not be jrNingja, but YOURSKIN_NAME instead.
OR
2. Go to your ACP > Skin Settings > Skin Images and upload a new image for the wrapper_bckgrnd.png image. After uploading be sure to check the check box to select that images as the wrapper background image then reset your system cache and image cache. You may also need to clear your browser cache.
Hope this helps!
--
Douglas Hackney
Jamroom Team - Designer/Developer/Support
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