If you do not have any out of pocket expenditures, you are not eligible for a tax credit. Do not enter the 1098-T form, in TurboTax (TT).
The 1098-T is only an informational document. The numbers on it are not required to be entered onto your tax return. However receipt of a 1098-T frequently means you are either eligible for a tuition credit or possibly you have taxable scholarship income.
If you have neither, do not enter the form.