Add and launch the CBS app on your iPhone or iPad, and follow the instructions below:

1. Tap the "Sign In" button.

2. At the bottom of the screen, tap "Purchased through iTunes? Restore purchase." 

3. You'll then be directed to sign into the iTunes store. Enter your Apple ID and password, and your CBS All Access subscription will be automatically restored.

You're all set! You can now start streaming your favorite shows, movies, live TV and more.