Cancel an Audible-Apple subscription

I recently signed in on Amazon for Audible app. Since I wanted to listen to books on my apple device, I chose Apple which now is defined as Audible-Apple. There is a 30 day free trial (I am into this less than a week) BUT I want to cancel the service now. When I go through the steps to cancel, it will only allow me to "pause" but I want to "cancel." Please help. BTW, Amazon says I must cancel with Apple.