Ipad reaet

If your device is Activation Locked, this help page will provide most of the information that you’ll need:

https://support.apple.com/en-us/HT201365

If you have forgotten your AppleID or associated password, these can be recovered here:

https://iforgot.apple.com

To recover your credentials, you’ll need access to one of the following:

• Your primary email address mailbox that corresponds with your AppleID
• Any of the secondary/recovery email addresses that should be configured for your AppleID account
• Any of the trusted telephone numbers (fixed line or Cellular/Mobile) that are associated with your AppleID

Unless you AppleID account has not been fully/correctly configured, or has been seriously neglected, recovery of the AppleID and password should not be difficult.

More information about recovery of your AppleID:

https://support.apple.com/en-us/HT201354

More information about recovery of your AppleID password:

https://support.apple.com/en-us/HT201487

When you recover access to your credentials, you would be well advised to log-in to your AppleID account from a web browser - and verify/update any email addresses and trusted telephone numbers:

https://appleid.apple.com

You may check out the following Apple Support links provided below: 

• Change your Apple ID (Be very aware of the restrictions here.) 
• What to do [before or] after you change your Apple ID or password 

Keep in mind that things done under one Apple ID doesn't transfer to a new Apple ID. For example, if you made an App Store purchase under an old Apple ID, then the item purchased will not be available under the new Apple ID. Another example is that you will not have access to anything in iCloud/iCloud Drive under your old Apple ID. So it is recommended for you to back these things up to a computer before changing your Apple ID. 

Hope it helps!