To change your Apple ID on your iPhone, follow these steps:
- Go to Settings: On your iPhone, open the Settings app.
- Tap Your Name: At the top of the Settings menu, tap on your name (Apple ID, iCloud+, Media & Purchases).
- Tap Sign-In & Security: Select "Sign-In & Security."
- Edit Email & Phone Numbers: Tap "Edit" next to "Email & Phone Numbers."
- Remove Existing Email: Tap the red "Remove" button (circle with a minus sign) next to the email address you want to change, then tap "Delete".
- Choose Another Email Address: Tap "Choose Another Email Address" and enter your device passcode if prompted.
- Enter New Email Address: Enter the new email address you want to use as your Apple ID, then tap "Continue." Follow any on-screen instructions to verify your new email address (you'll likely receive a verification code to that address).