Add the following code in your functions.php file . File is locating at wp-content/themes/flex
remove_action( 'genesis_entry_footer', 'genesis_entry_footer_markup_open', 5 );
remove_action( 'genesis_entry_footer', 'genesis_entry_footer_markup_close', 15 );
remove_action( 'genesis_entry_footer', 'genesis_post_meta' );