If you have education expenses from a Form 1098-T to enter, you'll do that by clicking on the Federal Taxes tab, then Deductions & Credits, then scroll down to Education and select Expenses & Scholarships (Form 1098-T). Then follow the prompts.
You can't take both the American Opportunity Credit and the Lifetime Learning Credit for the same student on the same return. TurboTax will ask you some questions in order to determine eligibility and which credit is more beneficial to you.