Summarize the following:
It's a blue app with a white A in a white circle. The iTunes Store app for iOS is not the same application It's a magnifying glass icon at the bottom (iPhone) or top (iPad) of the screen. It's at the top of the screen.  It's to the right of the iTunes Store icon.

Summary:
Open the App Store app. Tap Search. Type itunes store in the Search field. Tap iTunes Store when it appears in the search results. Tap GET.