Simply download the app from the App Store and follow the instructions below.
1. When you launch the app for the first time, you'll see an upsell screen. Tap "Get Started." If you've previously opened the app, from the home screen, tap the Try 1 Week Free of CBS All Access button, and then "Get Started."
2. Select the plan of your choice (Limited Commercials or Commercial Free) and tap "Continue."
3. On the Sign Up screen, enter your full name, email address and password of your choice. Your email address and password will be your CBS All Access login.
4. Tap "Subscribe" and confirm your purchase via iTunes.
That's it! Now you can stream your favorite shows live and on demand, along with movies, original series and 4 channels of live TV.