Here's a screen shot I made.
To finish 2015 you can sign into your account and on the My Tax Timeline Welcome Back page, download the tax file. It will end in .tax2015. Then you can open it in the Desktop installed program to continue so you don't have to start over. See screen shot. If you paid for the Online version you can call in and ask for the Desktop program download.
Contact Customer Service,
https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number?jump_to=answer_3300041
If you haven't paid for the Online version you will have to buy the Desktop program here,
https://turbotax.intuit.com/personal-taxes/past-years-products
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.