I am doing this for a friend. Stared ok until I got to her birth date, and had to call her. now I can't get back in.

You have to sign onto your account with the exact same userID and password you used to create the account.

If you may have forgotten some of your login information, see the following TurboTax support FAQ -https://ttlc.intuit.com/questions/1901535-forgot-your-turbotax-user-id-or-password

Or you may have multiple accounts, see this - https://ttlc.intuit.com/questions/1901486-problems-associated-with-multiple-turbotax-accounts