Or---did I misunderstand----do you mean that you prepared a 2018 return using TurboTax but you did not file it? If you want to file it now, you have to pay your TurboTax fees and then print, sign and mail it in. It cannot be e-filed.
https://ttlc.intuit.com/questions/1900990-how-do-i-file-a-prior-year-tax-return
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