To access your current online tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com/
Scroll down to the bottom of the screen and Click on Add a state
This will take you back to the 2017 online tax return.
See this TurboTax support FAQ for changing from mail to e-file - https://ttlc.intuit.com/questions/2403338-how-do-i-change-from-mail-to-e-file
