Once a tax return has been filed and accepted, the only way to change it is to prepare, print and mail an amended return form 1040X. DO NOT change your original return until you start the amended return. An amended return should not be filed until your original return has been processed and you have received the refund if you are getting a refund.
Here is a link to help you amend your return: https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
Amended returns must be printed and mailed by you. They can't be efiled and TurboTax does not print and mail them for you. In normal times, they take 16 weeks to process. It is taking much longer now because the IRS is not processing any mailed returns and hasn't been for some time. Once they start processing it, you can track the status using this link: https://www.irs.gov/filing/wheres-my-amended-return
