TurboTax does not support tax year 2018.
If you are trying to file the 2018 tax return for a tax refund, the refund will not be paid. The 2018 return with a tax refund had to be filed on or before April 18, 2022.
If you have taxes owed on the 2018 tax return you need to complete the tax return as soon as possible and pay the taxes owed. Penalties and interest will continue to accrue until the taxes are paid.
You should seek out a local tax professional to assist you with completing and filing the 2018 return.
Or you can use the IRS website for prior year forms and schedules, complete, print, sign, date and mail the return to the IRS - https://www.irs.gov/prior-year-forms-and-instructions
