If you are a desktop program user and still have the sofware installed for those years, you can use it,
if you are an Online user, you have to ask TurboTax Support to give you software for 2020 and 2021.
OTHERWISE,
You must be very familiar with Form 1040-X, or able fo become familiar quickly, to do it manually.
The penalty from Form 5329 goes on Form 1040-X line 10. Col B.
adjust the subsequent lines 11-20 to show that you owe that much more money.
When mailing 1040-X, do not include your old 1040 nor your revised 1040 because the Form 1040-X reflects any changes there and becomes your new tax return.
Therefor your amendment is two forms, Form 1040-X and Form 5329.
@JGH1976
