I cannot get back to my Fed and State returns. It says it is ready for mailing, but I have not completed the return.

To finish or make corrections to your return after TurboTax says "Ready for mailing" but before you've mailed your return, you can "add a state" to make changes:

1.    Sign In to TurboTax Online

2.    Click "My TurboTax" menu.

3.    Press "Visit My Tax Timeline" 

4.    Under the "SOME THINGS YOU CAN DO" heading, choose "Add a state" (you're not really adding a state, this allows you to get back into your return). 

5.    Complete/correct as needed.