Esther Moudy-Gummere on "Trying to add "order" function to posts..."

I'd like for my posts to appear in a certain order on category pages, which theoretically is possible by only slightly modifying the snippet from the add_post_type_support in function reference here like this:

//ATTRIBUTES
////
add_action('init', 'my_custom_init');
function my_custom_init() {
	add_post_type_support( 'post', 'page-attributes' );
}

The meta-box for "order" comes up and it saves, but unfortunately doesn't affect the order in which the posts appear.
Anybody have any ideas how to make it happen?

Thanks in advance!