If you paid more than the amount reflected in Box 2 of your 1098-T you can select the option in TurboTax to indicate the amount you actually paid, simply access the 1098-T in TurboTax and under the entry for Box 2 you will see "What if this is not what "the Student" paid to this school?" click on this and you will be able to enter the actual amount paid.
Please view the screenshot below:
