How to add a tumblr background image to this theme?

C

Courtney

New member
This is my tumblr :
http://breathecourtneyx.tumblr.com/

And I want it something like this:
http://sandraaa-.tumblr.com/

I want to know how to have a fixed image as the backgroud!(:
I have no clue how to work HTML or CSS


please help(:

if it helps I want to use this immage as the background:
http://www.infiniteconnections.us/images/Nebula_RCW49_04_lrg.jpg
 
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