Issue with the background image

The background for my forum always repeats itself and doesn't scale properly. The default image is set at 1366 x 768, which is the same resolution as my laptop monitor, however, when I upload the image as a backgrouns image for my forum, it decreases in size and automatically repeats itself. How do I fix this?



If there is any coding that needs to be done, I'll have to be talked through it since I do not know how to code.

http://dragonballera.forumotion.com/

Did you check the fixed background box?

Try to add this code in your css

Code:

body {
    background-size: 100%;
    background-attachment: fixed;
    background-repeat: no-repeat;
}