Get your taxes done using TurboTax

Thank you for the clarification and swift response.  A couple of questions:

  1. Do we need to use the system/application with which he filed before (in his case EZtax)? Or can we access his previous file via Turbotax?
  2. Is there a different form to be filled in for amending existing one? If so, please explain to me the steps.  Thank you so much!