You don't have to transfer from 2020. You can do 2021 from scratch. How did you do 2020? You can try to transfer from a pdf file or another company's file. Transfer pdf to Online version. See the section if you used other software last year.
https://ttlc.intuit.com/community/entering-importing/help/how-do-i-transfer-last-year-s-return-into-...
BUT you only have a couple days to use the Online version and efile. Online closes on Oct 17. If you have to finish after that you need to use the Desktop CD/Download program on your computer and mail your return.
Start an Online return here,
https://turbotax.intuit.com/personal-taxes/online
Or buy the Desktop CD or the Download program here,
https://turbotax.intuit.com/personal-taxes/cd-download
