From Mattingly posted an update
To access SHOWTIME Anytime on your streaming device or Smart TV you need a SHOWTIME subscription from a participating TV provider or streaming service, along with a high-speed internet connection.
Prerequisites to Install Showtime Anytime
Showtime Anytime is available on Amazon Fire TV, Android TV, Apple TV, Chromecast with Google TV, LG TVs, Roku, Samsung Smart TVs, and Xbox One. Here are the prerequisites you’ll need to access Showtime Anytime.
Your cable or satellite provider must be part of the Showtime program and licensed to stream the service.
You must have an active Showtime subscription with your cable or satellite provider.
You need a registered Showtime Anytime account before activating the service on your device.
To create your account, open Showtime’s website and follow the registration prompts. You’ll need your provider to enroll, such as Time Warner, DirecTV, Dish, etc.