Changing country/region not working

When I tap on the bar to put in the info, only part of the keyboard shows up and doesn’t let me access the other side.

Try this -> go to Settings -> Greneral -> Keyboard -> Turn OFF One-handed Keyboard.

Take a look at here :

Use your iPhone or iPad to change your region

1. Open the Settings app. 
2. Tap your name, then tap Media & Purchases.
3. Tap View Account. You might be asked to sign in.
4. Tap Country/Region.
5. Tap Change Country or Region.
6. Tap your new country or region, then review the Terms & Conditions.
7. Tap Agree in the upper-right corner, then tap Agree again to confirm.
8. Select a payment method and enter your new payment information and billing address, then tap Next. You must enter a valid payment method for your new country or region.*

Use your computer to change your region

1. Open the Music app or iTunes.
2. In the menu bar at the top of the screen or the top of the iTunes window, click Account, then click View My Account or Account Settings.
3. Sign in with your Apple ID.
4. On the Account Information page, click Change Country or Region.
5. Select your new country or region.
6. Review the Terms & Conditions, then click Agree. Click Agree again to confirm.
7. Enter your new payment information* and billing address, then click Continue.

Please start your own thread instead of tagging onto one that’s been dead for over 9 months.

Tried this but got:”You cannot change the store front information for your account at this time.” So I cannot update payment information so I cannot download any apps.

why i can’t change my app store region?