Here are the instructions to amend your tax return.
https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-turbotax-online-return/00/27577
Before you change anything please make sure that your tax return was accepted and processed by the IRS, probably late in February. If you only need to change a tax return that was rejected, then you can do that after it's rejected and e-file it once again.
Answers are correct to the best of my ability but do not constitute legal or tax advice.
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