If you haven't filed you can just leave and abandon it. You can try to clear It.
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-clear-and-start-over-in-turbotax-online/00/26444
I can't clear it's says that I registered my account
You can just leave and abandon it. You can start over and make a new account. You didn't file yet, have you?