Get HBO Max right away. Open the app, then click “Sign in.” Choose to log in with your TV or mobile provider. Choose Prime Video Channels as your provider choice. Sign up with your Amazon account.   After logging in, you can view HBO Max content. Please be aware that in order to view HBO on Prime Video Channels, you must have the Prime Video app. Here’s how to get started:   Visit Amazon.com/HBO to subscribe to HBO. On the streaming device of your choice, download the Prime Video app. Activate Prime Video and select “Sign In.” If you’ve forgotten your password, you can reset it here. Register Now.