TurboTax transfers only from the prior-year information. If you didn't use TurboTax in 2017, the program won't transfer in information.
However, there are some other options for transferring info in if you used certain other providers. See the information in the TurboTax FAQ below for some possible options. If these don't work for you, you'll need to begin your 2018 return in TurboTax as if you've never used TurboTax before...from scratch.
https://ttlc.intuit.com/replies/3301662
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***