Step 1: From the Main Menu, go to Settings




Step 2: Under Settings, go to iTune Store
2iTuneStore.jpg


Step 3: Click on Location
3Location.jpg


Step 4: Change your Location to United States as shown
4toUSA.jpg


Your iTune Store preference should appear as followed
5LocationNew.jpg


After the settings has been applied, US ATV available apps will appear on your main menu


If your website icon is still hidden after changing iTune to United States, go to Settings > General > Parental Controls and set the app to "Show"

http://support.apple.com/kb/HT5490