After you file

I did not use Turbo Tax for my 2016 tax returns. I paid to file taxes for 2014, the year I am trying to get access to. I have located the 2015 in my account and when I click on it, it states I need to upgrade. I would love for you to tell me the precise steps. What I have found on your website always leads me back to completing a tax return for 2016 (I have already done this, with a different source).