How do I activate my CBS All Access account after I add CBS All Access to my SHOWTIME subscription?

Once you’ve added CBS All Access to your SHOWTIME subscription, you will need to link your SHOWTIME username and password with your CBS username and password.  To do so, go to or click the 'Activate Now' button upon signup. Create a new CBS account or enter your existing credentials and follow the instructions to link your CBS and SHOWTIME accounts.