How Can I Change Post Order?!

Sounds like your theme’s index.php template file uses a custom query that needs amending. You can switch temporarily to the default theme to confirm this.

I couldn’t quite understand what you were saying. Isn’t it default for all themes to show the posts in the order that they were posted?

Save messing around with query strings, and query_posts, add this to your theme’s functions file.

add_filter( 'pre_get_posts' , 'home_order_switch' );
function home_order_switch( $query ) {
	if( $query->is_home )
		$query->set( 'order' , 'asc' );
	return $query;
}

NOTE: Make sure this is placed inside the opening and closing PHP tags, backup first if in doubt.