How to Change WooCommerce new order email?

I have found the line I need to edit I think

<p><?php printf( __( 'You have received an order from %s. The order is as follows:', 'woocommerce' ), $order->get_formatted_billing_full_name() ); ?></p>

would that change to

<p><?php printf( __( 'You have received an order from %s. The order is as follows:', 'woocommerce' ), $order->get_user() ); ?></p>

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)