Copy and paste the code in functions.php of your current theme.

// Remove the container section in trackform

function remove_my_action() {
    global $WPCargo_Container;
   remove_action('wpcargo_after_track_details', array( $WPCargo_Container, 'track_shipment_container_details_callback'), 1, 1);
}
add_action( 'wp_head', 'remove_my_action' );