How do I unlock and change my Apple Account on a locked iPhone?

You cannot delete a locked account from a device, you need to unlock the account first.

If the Apple Account is disabled, and the Phone is in Activation Lock, you will need to get the account unlocked first, once that is done and you can access the account, then you can enter the password for the account on the Activation Locked iPhone to release it.

click here ➜ If your Apple Account is locked, not active, or disabled - Apple Support

If the device is activation lock you can request Apple remove activation lock if you can prove ownership of the device via a sales receipt from Apple or an authorized Apple reseller.

click here ➜ How to remove Activation Lock - Apple Support

If something else is locked, then you'll need to explain in more detail what exactly is locked or happened.

Thank you for reaching out. 🤗

If you are not the original owner, then Activation Lock is a security feature to protect the owner from theft. In that case, only the original owner can unlock it. 🔓

↓ If you are the original owner: ↓

According to Apple:

Remove Activation Lock on the device

Follow the onscreen steps to enter the Apple Account and password you used to set up your device or your device passcode. If you don't remember your Apple Account, try to sign in with an email address or phone number that you regularly use for Apple services.

Learn how to find your Apple Account or reset your Apple Account password.

If your device is owned by a business or educational institution, please contact your IT department or manager. 

Remove Activation Lock on the web if a device is offline

For iPhone, you might be able to remove Activation Lock on the web even if your device isn't offline.

1. Go to www.iCloud.com/find.
2. Sign in to your Apple Account.
3. Select the device that you want to remove from iCloud.
4. Click Remove This Device.

Start a support request

If you need help removing Activation Lock and have proof of purchase documentation, you can start an Activation Lock support request.

Thanks again for reaching out. 👍🏼

Smiliñ 😎 Brian

Have you, by any chance, come into possession of a used iPhone, only to discover that it is Activation-Locked to someone else? If so, the phone was not prepared properly for resale. It may even be a lost or stolen iPhone with which the owner did not part willingly. In that case, see The All Too Common SAD Reality of Buying a Used iPad/iPhone – Apple Community .

If the phone is logged in to your Apple Account, but Apple has locked that account, see If your Apple Account is locked, not active, or disabled - Apple Support . As the others indicate, you cannot log out of a locked account, yourself, although Apple may be able to remove Activation Lock and reset the phone if you have proof of original purchase from Apple or an Apple Authorized Reseller.

Are you saying that the iPhone is Activation Locked?

If yes......click the link below:

https://al-support.apple.com/#/