Why can't I edit the background picture of the Free Icon-Based Template?

Hello all,

New to Articulate Storyline: I downloaded the Free Icon-Based Template (https://community.articulate.com/download/free-icon-based-template) and wish to change the background picture, as well as the background color of the module boxes (currently it is a grayish blue). However I can't change it. I can change the icons and texts, but nothing else. 

Can someone teach me how to edit the main background picture and the background color of the boxes? I also wish to change the color of the plus signs as well as the background color of the drop-down menu. 

Thanks a lot for any advice!

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