After you file

Oh, or are you using the Desktop installed program?

How to amend a 2019 Desktop return

https://ttlc.intuit.com/community/tax-topics/help/how-do-i-amend-my-2019-return-in-the-turbotax-cd-d...

 

Another way to amend is from inside your return.  Open your return,  you might have to select Add A State to get back into an online return.

 

Then go to........

Federal Taxes or Personal (for Home & Business)

Other Tax Situations