How can change background picture in my site?

Dear all

I’m newbie, and I created this site: xemttbd . Everything is good, but when I add text - Trực tiếp bóng đá miễn phí" then I can’t change my background picture.

Someone helpme ?
Tks

Mmm not sure I quite understand is this on WordPress or your own template or site builder?
All are pretty straight forward?

I can see you’ve built your site with our easy one click builder.

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