Support Forum

Actually I figured it out, I think.

Used this code

add_action( 'wpsp_before_header','wpsp_add_custom_meta' );
function wpsp_add_custom_meta()
{
    $meta = get_post_meta( get_the_ID(), 'multiple_images', true );
    if ( isset( $meta ) && '' !== $meta )
        echo '<div class="badge"><span>Gallery</span></div>';
}

and it works 🙂