When you go to our main site, you click on the sign in button for 2016. 

https://turbotax.intuit.ca/tax-software/index.jsp

For all other years check here: (The years are tabs across the top)

https://turbotax.intuit.ca/tax-software/prior-year-taxes.jsp#2016 

What if I originally went in and did my 2015 taxes on your site however I needed another document, how do I get back into 2015 to add said document?