The program (and the IRS) defaults to the first name that is entered. Are you trying to file Married Separately? You must set up a new TT account with a new user ID and password. But why not file Joint?
If you have your own TurboTax account and you're having a hard time logging into your account on the sign in page because the web browser defaults to your husband's account:
If you don't have your own account, never start a second return by going back and replacing the info in your completed return. This will permanently overwrite your tax return, which means you won't be able to retrieve your copy later.
Instead, follow the steps below.