Extra fields are not adding in form

The fields are not adding in the registration form using a plugin. I am trying to add it manually using a code that is in this complete guide https://wpitech.com/add-woocommerce-registration-form-fields/. Is there any alternative to do this? It would be really helpful if you could help me to add fields in the registration form. function Woo_register_fields() {?> * <?php } add_action( 'woocommerce_register_form_start', 'Wooregister_fields' );