Do you mean you filed your 2020 taxes and added Stimulus Info?
You can't make any changes to that return right now. If it is later Rejected by the IRS, you will be able to open your return and change your entries to the 'stimulus questions' in the Federal Review section.
If your return is accepted by the IRS (sometime after February 12), wait until you receive your Refund and then you can Amend Your Return if you need to.
Click this link for instructions on How to Amend your 2020 Return.
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