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You can't. Just make the account inactive.
If you do not activate your Moshi Monsters account, the information will be deleted after a certain amount of time.
you just go to email and you do it
It is impossible to do that.
If you do not have access to the email address you sent it to you cannot activate your account. If you want to play, make a different account but make sure to use an email address that you do have access to so you can activate your account.