TurboTax does not support tax year 2018.
It is also to late to file a 2018 tax return for a tax refund. The 2018 return had to be filed on or before April 15, 2022.
It you have taxes owed on the 2018 return it should be filed as soon as possible since penalties and interest continue to accrue until the taxes are paid.
Seek out a local tax professional to assist you in completing the 2018 tax return.