I believe you are referring to the Tuition and Fees Deduction.
As it stands now, Congress still has not approved the extension of the Tuition and Fees Deduction for tax year 2018. At this time, it is unknown when, or if, Congress will approve this deduction.
If the deduction is approved, you can file an amendment to claim the deduction. You can click here for instructions on Amending your tax return: How to Change a Tax Return You Already Filed.
