wordpress insert code

I need the customer to be able to cancel the order from his account, a code could be used that solves this problem but as the guide indicates it should be inserted in the [login to view URL] file of the child theme but currently the site does not have a child theme and I have no intention of creating it, so find a solution through this code or an equivalent personal solution. /** * This snippet will add a Cancel button to every order in your order list. */ add_filter( 'woocommerce_admin_order_actions', 'add_cancel_order_actions_button', PHP_INT_MAX, 2 ); function add_cancel_order_actions_button( $actions, $the_order ) { if ( ! $the_order->has_status( array( 'cancelled' ) ) ) { // if order is not cancelled yet... $actions['cancel'] = array( 'url' => wp_nonce_url( admin_url( '[login to view URL]' . $the_order->id ), 'woocommerce-mark-order-status' ), 'name' => __( 'Cancel', 'woocommerce' ), 'action' => "view cancel", // setting "view" for proper button CSS ); } return $actions; } add_action( 'admin_head', 'add_cancel_order_actions_button_css' ); function add_cancel_order_actions_button_css() { echo '<style>.[login to view URL]::after { content: "\00274C" !important; }</style>'; } Deadline: - I need this issue to be resolved within 36 hours. If you have the required skills and can meet the deadline, please bid on this project.