You should wait for your original return to be processed (refund deposited). Amendment forms are projected to be available mid to late March in TurboTax.
Once all that happens you can simply select the "Amend" option when signing in to your TurboTax account and follow the prompts to complete the amendment.
Amendments will need to be printed, signed and mailed in.
You have up to 3 years from the return due date (15 Apr 2021) to file an amendment to request a refund.
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