Please refer to the below TurboTax FAQ to determine if filing an amended return is necessary as well as instructions on how to amend your tax return:
https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-turbotax-online-return/00/27577
Please note the Form 1040X is currently scheduled to be released on February 26, 2020.