add_post_meta displays in admin edit area
Just add custom-field support to your custom post; register_post_type( ‘YourPosts’, array( ‘labels’ => array( ‘name’ => __( ‘YourPosts’ ), ‘singular_name’ => __( ‘YourPost’ ) ), ‘public’ => true, ‘has_archive’ => true, ‘supports’ => array( ‘title’, ‘editor’, ‘custom-fields’, ) ) );