On your Android TV:
1. Search "CBS All Access" in Google Play
2. Select "CBS All Access"
3. Select "Install" and "Accept"
4. After app successfully loads, you'll see the CBS All Access home screen 

On your web browser:
1. Visit the Google Play store here
2. Log in with the same Google user credentials you used to log in on your Android TV
3. Click the "Install" button
4. Select your Android TV device
5. The app will load on your device within a few minutes