Not sure what your question is.
You can start another return in TurboTax Online by:
Logging out if you are in your account
Choose what TurboTax Online product you want to use for the second return
Create your account screen
Set up a new login for the second return
Start working on the new return
If you did your tax return somewhere else you can try to clear it or abandon it.
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-clear-and-start-over-in-turbotax-onli...
