When you subscribe via the Amazon Fire TV app, you'll receive a confirmation email from Acorn TV that includes a password. This password allows you to log in to other devices including Roku, Apple TV, iPad, iPhone, and the Acorn TV website. 

If you did not receive the email, you can obtain a password by visiting this page. Enter the email you used when you signed up for Acorn TV, and we'll send you a new password that you can use to log in to other devices.