WELL .... since you used the registration program against the WARNINGS that told you not to do so if you would be filing a real return .... you must now AMEND the return.
Now ... if you used the TT registration program you can log in and start the amendment process.
If you used the IRS registration option you will need to start a 2019 return and enter in $1 of bank interest ONLY, then complete the FILE tab choosing to mail in the return. ONLY then can you log back in and start the amendment process ...
How to amend an Online return
https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-turbotax-online-return/00/27577
