Sorry you can not Delete or merge accounts. You can try to clear the Online account but only if you haven't paid or registered the Online account. How to clear
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-clear-and-start-over-in-turbotax-onli...
If you want to use the Online version next year you can use the same Online account or just start a new account so it doesn't transfer the wrong info. You can Transfer 2020 from your computer into the Online version instead of from the online account. Come back next year and ask us how. You will need to have the file ending in .tax2020 on your computer.
