I seemed to have finalized my return but only printed it. I just need to add a 1099 but it only lets me amend it. I dont need to amend it, just need to add more forms.

Please follow the instructions below to make changes or add to your still as unfiled return:

1. In TurboTax Online, sign into your account.
2. Select Tax Home in the left menu.
3. Scroll down to Your tax returns & documents.
4. Select 2018, and then select Add a State (you're not actually adding a state, this just opens the return back up)
5. Make changes and then refile (do NOT refile if you have already submitted your return… unless it was rejected to make a correction(s)).

Please read this TurboTax FAQ for additional information about importing a Form 1099: How do I import my 1099?