I'll need to add some change on my 2019 taxes and I'll receive another W-2 form in the mail
Please see the TurboTax FAQ: How do I add another form (like a W-2) or add/change/update something after I already filed? for assistance when you receive another W-2 after filing.
Please note the Form 1040X is currently scheduled to be released on February 20, 2020.
They chamged date now until the 26th. 3rd time they changed it this year. I am ready to get the form and do it myself!