If you are using TurboTax Online, you can search for tuition on the Tax Home page. Then check off Unused Tuition Fees and continue from there.
If you are using TurboTax Desktop in EasyStep mode, you can use the Find tool to search for Unused Tuition.
If you are using TurboTax Desktop in Forms mode, you can search for Schedule 11 (and provincial S11, if applicable) by clicking on the Forms icon in the blue icon bar.