Here are some easy steps to activate vudu TV Apple TV :
First of all You have to install vudu TV Application on your Apple TV.
Now you have to open vudu TV App.
Now you have to sign in with your vudu Account.
After sign in You will get a unique Activation Code on your Apple TV screen.
After geting the code you have to Activate it online.
To activation process you have to visit vudu.com/start.
Now enter the Activation code on the submit box.
Then click on activate button.
Now you are all set.
Now you can enjoy vudu Tv on your Apple TV.