...........make sure the notification is "Real". Fed and states do not notify you by email, only snail-mail...call the official IRS and/or state Tax people separately to ask if you aren't sure..
....If you prepared 2019 and PAID for the "Online" software for that year. Then you could log into that account and download the file as a PDF document...print..sign..date, add any documents showing tax withholding and mail it in. (Fed and state(s) forms go to different places). (no e-filing for old tax files)
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IF you prepared it with the "Online" software, but didn't actually pay for the 2019 software at that time, then you'd have to go to the IRS website...find the PDF form downloads for that year, and prepare-mail in manually yourself. States usually have their own web-page with old tax forms and instructions...so same thing.
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IF you prepared with the "Desktop" software, and have the PDF files....then you could also print-sign-date-include withholding forms, and mail it in. If not, you're back to getting the forms from the IRS&State(s) websites and preparing manually to mail in.
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____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
