I need to add a field with company name to my checkout in WordPress WooCommerce. First, I tried this code example: add_action('woocommerce_before_order_notes', 'true_custom_checkout_field' ); function true_custom_checkout_field() { echo 'Однажды тут будет поле.'; } But nothing happened. Then I installed Checkout Field Editor for WooCommerce and Checkout Manager, both didn't work. Is it a problem with my free theme called "Boutique Designer Shop"?