My Y and Z changed places on my iphone keypad. how do i fix that?

You have probably activated either a QWERTZ (instead of QWERTY) or a foreign language keyboard. When the keyboard is open, check for a key to the left of the space that looks like a wireframe globe. Tap it if it's there. You should be able to change it back to a standard keyboard.

If the above does not work then check keyboard settings by opening Settings ➡️ General ➡️ Keyboard ➡️ Keyboards: Here, ensure that correct Keyboard(s) is/are listed.

Axel F.