How do I change the background of my forum? I dont know which place to edit in the templates section, my forum is manunitedzone.co.uk - I want to get rid of the Grey stripes and add an image.

Thanks :)

acp > themes > your theme > global.css > edit in advanced mode > and change
body {
background: url(images/your theme folder/your bg.extension)

Thanks, I did what you said and it works! :)