How to display WP-PostRatings rating?

Use the following code in child theme or special plugin FunctionsPHP:

add_filter( 'basic_singular_content', 'my_function' );
function my_function( $content ){

	if ( !is_single() ) {
		return $content;
	}

	$rating = do_shortcode('[ratings]');
	return $content . $rating;

}