You would have to amend your 2015 return and add the 1098-T from 2015. You cannot put it on your 2016 return. If you have not received a 2016 1098-T, you will not enter one there for the 2016 year.
You can go here https://ttlc.intuit.com/questions/3410543 and get instructions for amending that 2015 return.
And the instructions are below for where to enter the Form 1098-T when you are amending the 2015 return.
https://ttlc.intuit.com/replies/4194409
