I am tring to file taxes 2016,although I do not see a prompt for it?

I have adopted  my grandson and bacame finalized  in Nov. 2017. Thereforei did not file for 2016 due to not having his S.S #. Now I have optained,and I dont see a prompt to take me back to 2016. I have  filed through turbo tax in the past when I had no dependants to claim.