What is your model Apple TV box? Identify your Apple TV model - Apple Support
Your Apple ID account is needed for access to the Apple TV App Store. Each downloaded app gets linked to your account as “your app”. The Apple ID account needs all the true user information as requested, including name, DoB, country, a verified email address (respond to test message), and a valid payment method.
Review this support document for steps that may need supplemental information: How to create a new Apple ID - Apple Support.
One excellent way is to manage the account in the iTunes application.
Else manage it on the web (with a few less options there). Manage your Apple ID - Apple.
Apple ID support - Official Apple Support