How do I force 529 expenses to non-qualified in order to qualify for American Opportunity Credit?

In 2020, I withdrew money from a 529 plan to cover qualified Educational expenses. When filing my 2020 taxes, I realized that I need to treat part of the 529 withdrawal as non-Qualified in order to take the American Opportunity Credit.

 

How do I make this adjustment in TurboTax? I have been unable to locate a method in the questionnaire (and I've gone as far as completing the "Federal Review"), and I the forms do not seem to accept direct edits.

 

Thank you!