Purchased an iPad 3 at the Apple Store today and got it with Applecare+. I didn't have time to set it up at the store and activated my iPad at home, but I'm not sure how to add the Applecare+. Do I do it through the Apple Store website or iTunes? Or I'm wondering if this would have been something that was 'automagically' setup when I purchased the iPad with Applecare+.