Where do I find the navigation button? I want to look at my 2018 return.

You can access your prior year returns using the Documents tab in the navigation. 

When you sign in, make sure you're using the same TurboTax account (with the same username) as in prior years.

1. Select Documents from the navigation when it appears.
2. Use the drop-down menu at the top of the screen to choose the tax year you want and then select Download PDF.

Want to download your customer data including your prior year returns? Sign in to TurboTax and select Intuit Account to access all your data in accordance with our updated privacy policy.

cannot find the navigation button to get to the document button

You should be able to see documents as an option when you log into your account.

I can't find it either. I don't have those options when I sign in.