You have to enter qualified education expenses that you paid to receive an education credit. And there are other qualifications and income limitations also, see the link below.
If you believe you qualify for a credit and you have already filed, you can start an amendment. Add your 1098-T and other expenses. If you qualify for a credit, file the amendment. If you don't, you can cancel the amendment and no harm is done. How do I amend my 2018 TurboTax Online return?
Take
Advantage of Two Education Tax Credits