File taxes again? If you already filed a 2017 tax return and it was accepted by the IRS , to make any changes you have to amend the 2017 return that was filed.
See this TurboTax support FAQ for amending a 2017 tax return - https://ttlc.intuit.com/community/amending/help/how-do-i-amend-a-return-in-turbotax/01/27372
Otherwise -
To complete and file a 2017 tax return using TurboTax you would need to purchase, download and install on a personal computer one of the 2017 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
A 2017 tax return can only be printed and mailed, it cannot be e-filed.
