I had stocks in a company that went bankrupt in 2016. Can and where do I show the loss. It does not show up on my Scottrade 1099-div anywhere

[DDollar]

Yes, you can take the loss as of the date the company filed for bankruptcy (that will be the date of disposition).  You will enter in the same manner you enter a 1099-B. Start the process as if you were entering a new 1099-B, but indicate you did not receive a Form 1099-B.  TurboTax will ask you a series of questions and take you through the process.