How do I change my username

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To update your TurboTax account, see this TurboTax support FAQ - https://ttlc.intuit.com/questions/1900724-how-do-i-update-my-turbotax-account-information

To update your TurboTax Advantage account, see this TurboTax support FAQ - https://ttlc.intuit.com/questions/1900547-how-do-i-update-or-confirm-the-information-in-my-turbotax-...