Log in to:
privacy.apple.com
In there you can delete your Apple ID or correct information with your Apple ID.
Please note that you will obviously need the correct credentials to log in to said Apple IDs. Also note that many services are tied to said Apple ID so deleting an Apple ID means deleting access to anything tied to that Apple ID, permanently.
This includes, but not limited to, Apple Care, iTunes, Apple Music, Apple TV+, et al.
Since Apple IDs are typically the email address of the user, it has to be unique. If another Apple ID is using said email address, you will not be able to use it. iCloud.com email addresses have additional restrictions.
Remember, canceling a service is not the same thing as deleting an Apple ID. In the Apple ecosystem, deleting your Apple ID is like deleting your Social Security number.
Make sure you know which you are trying to do.