Please follow these steps on accessing last year's return: https://ttlc.intuit.com/questions/3404575-how-do-i-access-my-prior-year-2017-return

To access your prior year return before you file, you have to:

1. Be signed in to the same TurboTax account you’ve used in previous years.
2. Be in an upgraded version of TurboTax (or add PLUS to TurboTax Free Edition).
3. Pay for your upgrade.