You can't use Online TurboTax for a 2016 return at this point in time; it shutdown for 2016 in late October. Now it is open again, but only for 2017 returns.
You could prepare the 2016 returns in desktop software (CD/download) installed on your computer if it meets the minimum system requirements.
I see you are using Windows Vista. 2016 TurboTax desktop version requires Vista SP2 or higher. Do you have Service Pack 2 or higher?
https://ttlc.intuit.com/questions/1901571-minimum-system-requirements-for-turbotax-windows-software
If you meet the requirements, you can purchase the software from TurboTax at this link below, or you might be able to find it at a discount at a reputable authorized retailer such as Amazon.
https://turbotax.intuit.com/personal-taxes/past-years-products/ Or did you already start a 2016 online return prior to the shutdown? If so, and if you want to download to continue it, the FAQ below tells you how. If you already paid for the 2016 online return, TurboTax Support should furnish you the software.
https://ttlc.intuit.com/questions/2559403-how-do-i-finish-a-prior-year-return-that-i-started-in-turb...
