how do i file an amended 2017 tax return?

[VolvoGirl]

Sorry you can't use Turbo Tax to amend 2020 or prior.  You will have to go somewhere else or get the forms  from the IRS and do it by hand.

[Bsch4477]

You probably have to do it manually unless you happen to have the 2017 program and can get it work. 

[xmasbaby0]

You have not mentioned why you want to amend a 2017 return.   But it is too late to get a better refund for 2017 by amending.