For 2018, if there was no 5329 then you need to amend 2018 and enter the Roth contribution so TurboTax tells you that the amount of excess. Say in the interview that the excess was not removed. That should add the 5429 form with the excess and penalty and add that to the amended 1040X form.
For 2019, the excess would not be automatically transferred if it has not been reported on the 2018 tax return. Again in 2019 got to the Roth IRA contribution section and enter your 2019 contribution. Continue the interview and it will ask about a prior year excess. Enter the amount, Then it will ask if you want the excess applied to a 2019 contribution.
Amended returns can only be mailed. It is suggested that it be mailed certified with return receipt (or other tracking service) to verify that the IRS receives it.
See this TurboTax FAQ for detailed amend instructions:
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed
You can check the status of the amended return here, but allow 3 weeks after mailing.
https://www.irs.gov/filing/wheres-my-amended-return
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
