Type the following code into the CSS advanced background setting to change the background.. copy and paste the image url in its place
body {background: #ffffff url(https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIR01nuqvWpCZtM3QRDSTC_uS5hYz14sO38zwg7Emyk8bd1kDEslMGTOLpeV8OAK5WKKhfIPl7mncu2janNlnO3cR2-7Zzx0ADDtatD_lBUqPwb11dTnRKR9KZn9EUs0XKrN6LOtTunwA/s1600/background+wide.png) no-repeat center fixed;} .body-fauxcolumns .fauxcolumn-outer div, .body-fauxcolumn-outer .cap-top .cap-left {background:none;}
