How do I find my qualified education loan payments from last year?

You get those from the loan company or your own records. But, for tax purposes, you're not interested in student loan "payments", whether you're talking about loans you're paying back or payments to your college, while going to school. 

If you're paying off loans, you're only interested in the amount of interest you paid; that's deductible.  The loan company will report that to you on form 1098-E.

If you're going to school, you're only interested in how much tuition, fees and books you paid for, whether with loans or out-of-pocket.  That's partially provided on the 1098-T, supplemented by your own receipts, including the school's billing statements.