I am using TT Deluxe but it looks the same in other versions of the software. Here's what I did:
1. In the top left corner of the TT window select "Forms"
2. On the left hand side of the TT window there will be a list of all the forms in your tax return, select "Tuition Summary"
3. Scroll to Part II - Optimized Education Expenses for the Lowest Tax and select "3. Manual"
4. Go back to the list of forms and select "Student Info Wk" for the student taking the credit. The Student Info Worksheet will be directly below the Dependent Worksheet (Name) if it is for a dependent.
5. Scroll to Part VII - Education Credit or Deduction Election and select the credit you want to take.
6. Select "Easy Step" in the top left corner and continue with your return.
DO NOT RUN THE OPTIMIZER or it will change your deduction back to whichever deduction is most beneficial. In my case, it chose the American Opportunity Credit. Since you can only take that credit for 4 years and my expenses are pretty minimal this year ($50), I want to take the Lifetime Learning Credit and save the AOT Credit for more expensive school years.
