The TurboTax online editions for tax year 2018 can no longer be used to start a new 2018 tax return after October 15, 2019.
To create, complete and file a 2018 tax return you will need to purchase, download and install on a personal computer one of the 2018 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/cd-download/
A 2018 tax return can only be printed and mailed, it cannot be e-filed.