Education Expenses: Tuition & fees = zero. Says I entered them earlier. Where? They are not zero and I need to fix this. How/where do I enter them?

Working on Deductions and Credits.. Education Expenses. The page says "Tuition and Enrollment Fees" are Zero. The link on "tuition and enrollment fees" says I entered them earlier. Where? I want to fix them, since they are NOT zero. Where do I go to fix them. (I don't remember entering them at all.)