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-onli...

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?