Device limit error for Showtime Apple TV app and Showtime iTunes subscription

Hi,

I just purchased my 2nd fourth gen Apple TV and removed my old gen 2 Apple TV. After downloading the Showtime app, that works fine on my other 4th gen, I get an error like "Your household has exceeded its device limit. Before you can continue the primary account holder..." when trying to connect to my Showtime iTunes subscription.

I don't know how many devices I can run it on. I have the Showtime app also on my ipads and iphone.

I dont mind removing access from one of my other devices. I just don't see where I can do that at.

I looked at my iTunes account settings and on the Apple TV settings but can not figure out where to remove a device so that I can use the Showtime subscription on my second Apple TV.

Please help.