If the 2021 program opens your return you already have the data file ending in .tax2021 saved on your computer. You don't need to save it. Or you can save it again so you know the name and where it's saved. Go up to File - Save or Save As.
If you used the Desktop program last year here’s How to transfer into the Online version. You need to have the prior year .tax2021 file on your computer. It should be in your Documents in a Turbo Tax folder. Expand the link if you used the CD/download last year........
https://ttlc.intuit.com/community/entering-importing/help/how-do-i-transfer-last-year-s-return-into-...
