Layout and background question

I have purchased http://preview.byaviators.com/theme/ichurch/

Want to know how I should set the layout=Boxed and also how I can set the background of site to an image
.
Thanks!

Hello! This is just a general public forum. In this case, please directly contact theme author for the support: http://themeforest.net/item/ichurch-responsive-church-wordpress-theme/6965001