Did you already pay for the 2016 return Online previously, or is it locked because you didn't pay for it last year? Normally the way to unlock a 2016 return at this point is to purchase a 2017 product. You can discuss your situation with TurboTax Support by phone and see if they will unlock the prior return for you, or if they want you to purchase a 2017 product to unlock it.
Use the form at the link below to schedule a call back, or it may provide a number. Hours are 5AM-9PM Pacific (8AM-12 Midnight Eastern) 7 days/week.
Where it asks what product you are using, go ahead and say "CD/download" based on your purchase of the 2016 desktop software. Indicating CD/download there will make sure you are eligible for phone support.
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