To transfer from 2018 you need to start over with a new return. Go up to File-New. You can only transfer at the beginning before you start.
If you used the online version last year and need to transfer your info to this year's Desktop version there are 2 ways depending on what you have.
1. If you saved the actual .tax2018 file (not just the pdf file) to your computer before online was shut down in Oct. then start a new return and the very first thing you do is Transfer from .tax file. You can only transfer at the very beginning.
2. If you didn't save the .tax file to your computer or lost it, there is a way to do it by starting your return in the Online version, transfer to that and then continue in the desktop version. You won't have to pay for Online. See this…..
https://ttlc.intuit.com/questions/1901476-how-do-i-switch-from-turbotax-online-to-the-turbotax-softw...
Here's how to transfer last year's return to Windows…..
https://ttlc.intuit.com/questions/1901506-transfer-last-year-s-return-to-2018-turbotax-for-windows
How to transfer into Turbo Tax for Mac
https://ttlc.intuit.com/community/tax-data-file/help/how-do-i-transfer-last-year-s-return-into-the-t...
