The deduction from gross income (no itemizing required) for tuition and fees expired at the end of 2017. However, there is still some hope that it may be extended retroactively for 2018. And there is some talk that it will also be extended for 2019. If so, information will appear on jklasser.com.
On Form 1040X, you may file an amended return within a three-year period to claim a refund or correct a mistake made on an original or previously amended return.