Tax Tools is a link within the TurboTax online editions for a tax return. It is not on the Tax Home web page. The TurboTax online editions for tax year 2018 have shut down to make way for the 2019 editions which should be available in December.
If you need to complete a 2018 tax return originally started with the online editions then see this TurboTax support FAQ - https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-finish-a-prior-year-return-that-i-...
If you need to amend a tax return originally completed and filed using TurboTax then see this TurboTax support FAQ - https://ttlc.intuit.com/community/amending/help/how-to-amend-change-or-correct-a-return-you-already-...
If you completed the 2018 tax return using the online editions but did not file the return -
To access your current or prior year 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 on the section Your tax returns & documents click on Show. Click on the Year and Click on Download/print return (PDF)
A 2018 tax return can only be printed and mailed, it cannot be e-filed.
Print, sign, date and mail the tax return to the IRS. Include with the mailed return any forms W-2 and 1099 which have taxes withheld. Go to this IRS website for mailing addresses - https://www.irs.gov/filing/where-to-file-paper-tax-returns-with-or-without-a-payment
There are no penalties for filing a tax return after the due date if filing for a tax refund or there are no taxes owed