How do I delete a partially completed 2017 return (desktop version)? Does that clear all records of the user names and passwords that I entered to let it access my 1099s?

I am using the desktop windows version of TurboTax 2017. I let it access my 1099s online by providing user names and passwords to my accounts. I have not progressed beyond the income section and now wish I had entered that data manually. How do I delete this return and start over? Does that expunge all records of those user names and paswords?