Background Image for Column Section

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Hi all 

Im wondering if someone can help me out. I want to add a background image of the column section. I have read this one and tried to follow the instruction but I couldnt find the right place to paste the code Solved: Debut theme - add a background image to the section - Shopify Community

My website link is 

I want it to look like the image below (the section is circled in blue)