Did you close your business in 2016, or in early 2017? Once you've begun your 2017 return in TurboTax online, your prior year's information will automatically transfer into the 2017 return.
You'll need to delete your Schedule C that has transferred over from your prior year. See the TurboTax FAQ below for information on how to proceed. If you have any business assets that you are depreciating, you'll need to properly report disposal of those, as well as report the closure of your business.