Payment Response URL in WooCommerce settings for Worldpay

Hi

I have set up my site with WooCommerce and WorldPay. Everything is working fine for taking payment but, once the payment is taking and I am stuck to the payment page. I cannot redirect the customer back to my site. I have checked all the setting and the only thing I am missing is the Payment Response URL in WooCommerce settings. Unfortunately, maybe I am a bit simple, but I can’t find this one anywhere. I can find all the other ended point and url redirection except this one. Can somebody help?
And please do not send me to the woocommerce forum as i have read it 100s and still can’t get anywhere!:)
Thanks!