How can I amend my 2020 state tax return which was accepted a through efile a week ago?

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At this time, Form 1040X has not been finalized for printing or e-file. It's scheduled to be completed on 3/18/2021. You can check the forms availability for updated information. 

• Once the IRS has finalized the form and processed your return, see How to amend (change or correct) a return you already filed?

Generally, Form 1040-X,  Amended U.S. Individual Income Tax Return, must be filed within three years of the date the original return was filed, or within two years of the date the tax was paid, whichever is later.