You need to buy Turbo Tax Business here (last one on the far right). Don't confuse it with Home & Business. You need a full Windows computer to install it on. Not on a Mac and not online.
https://turbotax.intuit.com/personal-taxes/past-years-products/
But you needed to do the business return before your personal return. You will get a W2 or K-1 from the business return to enter into your personal return. So you will need to amend your 1040 return to add it.
