If you signed up with Google/Apple, you cannot change your email/password.
Heres how to find out if you did this:
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Open the Settings tab.
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Tap “Account Information”
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Under Email, if you see a proxy email (e.g., something like abcdefghijk@privaterelay.appleid.com), then you used Apple or Google to sign up.
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This means you cannot change your email/password.
If you signed up by creating an email/password, you can change this easily.
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Open the Settings tab.
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Tap “Account Information”
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Tap the arrow to the right of “Password” it to change it!