At the screen "Did (student's name) have any of these common situations in 2025", check the box "had education expenses other than tuition".
That will get you a screen, later, "Time to enter (student's name) educational expenses". Enter those expenses at "Optional books and materials from the school".
Although those items might be eligible for the American Opportunity Credit (AOC), they are not eligible for the Lifetime Learning Credit (LLC). Grad students are not eligible for the AOC.