1 year free subscription to Apple TV with purchase of new ipad
Why can't I watch Apple TV shows on my iPad now that I have signed up for the years free subscription?
iPad, iOS 13
That is such an open ended question.
To answer it more specifically, you can go here...
https://support.apple.com/en-au/guide/ipad/ipad09e806c9/ipados
...and review the sub-headings. Nearly all questions on ‘how to’ watch Apple TV on your iPad can be found there. It’s an Apple run site.