You’ll have to look at your home.php file and change the area that looks like this –
add_action( 'genesis_loop', 'optimal_home_loop_helper_middle' );
add_action( 'genesis_loop', 'optimal_home_loop_helper' );
^ and change “loop” to “after_header”.
All of the content is placed inside of the #inner id, which has a width of 960px and won’t allow anything to go beyond it. Changing the above code removes it from the #inner div so that you can go in and add or remove space, etc.
I would also recommend using the new version, 1.1. “Responsive” features were added plus much more. Backup your files first, or start from scratch if you do.