Follow the steps below to change the region to United States.

1. Launch Settings from your Home screen.

2. Tap on iTunes & App Store.

3. Tap on Apple ID.

4. Tap View Apple ID.

5. Authenticate with Password or Touch ID, if required.

6. Tap on Country/Region.

7. Choose United States.

8. Tap on Next.

9. Tap on Agree to consent to the terms and conditions.

10. Enter or skip the payment details by selecting 'None'.

You can use a random name, Street, City and Phone number, but you must match State and Zip code correctly, so use:

State AK - Alaska

Zip 99922