I cannot watch a program on Apple TV but I can watch that program on my iPad what is my problem

If you’re talking about Apple TV+, make sure that your TV is signed into the same Apple ID that your iPad uses. If you mean other shows on the Apple TV app, you might need to ensure that the third-party app is installed on your TV as well (so that Apple can direct you there to play the program). Otherwise, ensuring that you have a working network connection is important. You can also try uninstalling and reinstalling the app from the TV to see if that helps.