The form and instructions for amending a 2019 tax return are currently expected to be available approximately February 12. But do not file an amended return until the IRS has processed your first tax return and you have received your refund.
An amended return has to be filed on a special form, Form 1040-X. It cannot be e-filed. You have to print it, sign it, and file it by mail. It takes the IRS up to 16 weeks to process an amended return.
Wait til you receive your refund. Then go through amend refund on the TT page.
You will need to wait for your original tax return to be accepted by the IRS. Once that has occurred then you can amend your tax return.
To amend your return you need to log into your TurboTax account to see an option to Amend a Filed and Accepted Return. Click on that to start the amending process. Once you are finished making changes to your return you will need to print it out, sign, date and mail it to the IRS.
Please see the below FAQ for more information on amending your tax return:
https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-turbotax-online-return/00/27577