Only you can amend your tax return and the 2020 tax return cannot be amended at this time because the IRS Form 1040-X for amending a tax return is not yet available.
The Form 1040-X is scheduled to be available on 02/18/2021
See this TurboTax support FAQ on amending a tax return originally completed and filed using the 2020 TurboTax online editions - https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-turbotax-online-return/01/27577
