You are the only one who can see your 2018 return. Why are you unable to view it?
Do you need to know how to print/download? Has it already been paid for and filed, or is it still in preparation?
Is that on a worksheet?
Try printing from the Print Center
Log back in your TurboTax account and "add a state" to open the return back up (you are not really adding a state, just to open it back up), then
Click on Tax Tools on the left side of the online program screen.
Then click on Print Center.
Then click on Print, save or preview this year's return. Choose the option Include government and TurboTax worksheets
How to save the PDF