To the regular Turbo Tax Online version or the CD/Download Desktop program?  

For Online Turbo Tax you have to start over with a new account and enter everything again.  Start a new Online return here,  https://turbotax.intuit.com/personal-taxes/online/ 

For the Desktop program you might be able to download the .tax2018 file and open it in the Desktop program.  See if you can save your return as a tax data file ending in .tax2018.  Do you want to buy the Desktop program?

https://turbotax.intuit.com/personal-taxes/cd-download/