You will have to amend.
First, make sure that your 2020 return was accepted in TurboTax Online or paper-filed through the mail. You can't amend a return that hasn't been filed yet.
When you're ready to amend, find your situation below and follow the instructions.
Thanks. I did my tax return yesterday, i export the PDF file and not sent it out via mail, however, I find I didn't include 1099-HC on it, so I would like to fill it one more time, but the problem is that I can not access the Turbotax from the beginning, thank you the help.
As long as you have not Efiled or mailed the return, you can go back in and make changes. Please see the below steps:
In TurboTax Online, sign in to your account.
Select Tax Home in the left menu.
Scroll down to Your tax returns & documents.
Select 2020, and then select Add a State (you're not actually adding a state, this just gets you back into your return so you can make changes).