Associating iPad with Apple I.D.
Hello all. I recently puchased an iPad, on which I enabled my Apple I.D. I also made sure to authorize my Mac so that there would be no issue with syncing from one to the other. I downloaded an app for my iPad from the App Store with my Apple I.D. However, after I did so, I received an email from Apple stating that "my Apple I.D. was used to download content on a computer or device not previously associated with that Apple I.D." The letter then went on to say to ignore the message if I had initiated the download.
My question is how to associate the iPad with the Apple I.D., so that I won't receive any messages like this in the future each time I install an app or make a purchase. As I mentioned, I have already authorized my Mac, and established my Apple I.D. on my iPad. I tried using the advice on the "iTunes Store: Associating a device or computer to your Apple I.D.", but whenever I go to my account, the "Manage Devices" tab never shows up. Any help with this matter would be greatly appreciated. Thank you!
Here is the link to the article I mention above:
http://support.apple.com/kb/HT4627?viewlocale=en_US&locale=en_US
iPad 2, iOS 6.1.3