Only you can cancel the account ...
See this TurboTax support FAQ for updating or confirming the information in your Advantage account - https://ttlc.intuit.com/questions/1900547-how-do-i-update-or-confirm-the-info-in-my-turbotax-advanta...
If you no longer want the Advantage subscription see this TurboTax support FAQ for cancelling the subscription - https://ttlc.intuit.com/questions/1901052-how-do-i-cancel-my-turbotax-advantage-subscription
