I paid tuition out of pocket last year. Where do I enter that?

The cashiers office at my school told me that my 1098-T only shows what was billed to me, not what was paid. I have account information through my school and bank that shows how much I paid for tuition out of pocket. But also my 1098-T is showing that the amount in box 2 includes amounts for an academic period starting in January 2017. I know my 2017 tuition wasn't paid at all in 2016, so I'm really confused why it's being recorded for 2016. So my question is where exactly do I record my out of pocket tuition payment? And should I leave the box 2 amount as is or should I change it to what I paid for that 2016 semester, including loans, scholarships, and out of pocket?