After you file

I bought the Turbotax online version.  I can't find where to download it.  I found one place but it won't let me do 2018. 

 

I am happy to send the IRS a Schedule D but I have looked at the form online because I can't find it in Turbotax and I don't understand it.  The Schedule D form asks whether I am using Form 8949, for instance.  I don't know which one to use.  This is why I use Turbotax.   Does this mean I need to use a tax accountant if I can't figure out how to fill out this form by myself?  Please help.