There is no password, but if you mean the parental PIN, this has to be reset by Nintendo if you have lost it.
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You can do it that is change the name of account. You cannot change the email ID of the account. However you can change the display name of the account.
You could only change it if you know either the email or account id click on play, if you click on forgot account id, it will ask you for your email. if you click on forgot password, it will as you for your account id, but you will still need to know the email to change it.
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You can easily change the alternate ID. The alternate ID is the one which is used for account recovery. The ID can be changed from the settings.
Once your Gmail id is created, it cannot be changed. You have to create a new account for that. Your Gmail ID is unique at the time of creation.
Unfortunately you cannot change your windows live id. If you get it wrong or want to change it you need to create a new account with accurate details.
It is impossible unless you make a new account.
You can't but you can always make a new account
You can change your name, but you cant change your username. The ID that your create is unique and one time. The ID cannot be changed later on in time.
you cant:( only xbox lets u change your id
Once formed you cannot change your ID. It is the unique identification of yours. An ID is designated to a person at the time of account creation.
You can not change your name and can only add a new name or start a new account