As you have not been in the US for 5 years or part years on a F1 visa, you are still a nonresident for 2018.
TurboTax does not support nonresident returns.
However we have a partnership with Sprintax offering a
nonresident tax filing solution to our TurboTax customers.
Visit
the TurboTax/Sprintax site for more info or to get started.
