If you have not yet filed, you must pay the TT fees first.
You will need to pay before you print your 2018 tax forms or tax return. Please see this TurboTax FAQ:
https://ttlc.intuit.com/replies/3338601
To get a copy of your 2018 tax return that you filed this year, sign back in to your account and see the TurboTax FAQ below: https://ttlc.intuit.com/replies/3301525