At the beginning of the Education Expenses section, when you indicate that you want to enter expenses, click on 'Add a Student', and Continue.
The next screen asks 'if you got a 1098-T'. Say YES and Continue. Choose 'type it in myself'. The next screen should list everyone on your return and ask you to choose who the 1098-T is for (screenshot).
Click this link for info on How to Enter a 1098-T.