Hi THere

where is this Edit Page background box

here is where I found these instructions

I'd like to replace all of the master and layout region with a image back ground
I hope this makes sense

My question is
in site stylee mode, with read only un-ticked
graphic tab selected
I click on the background

in the css properties window

how do I globally change the background-image pic
in the css edit properties window ?

where is the Edit Page background box ?

Thanks for Your help