How do I access my 2017 return created w/TurboTax CD?

Last year I did several returns (myself, child 1 etc).  I want to amend one of them.  When I open the function for past year files I see some but not the one I need.  If I go to the function to start a new return the one I want is available to draw from.  How do I locate and open that file in order to amend it?