Where do I enter tuition and textbook credit for dependent K-12?

EDUCATION EXPENSES

Education expenses for grades K-12 are not deductible on your Federal return, whether for private, public, or home schooling, nor are the expenses for tutoring, after school lessons or after school activities, such as dance lessons, sports, etc.  Some states allow deductions/credits for K-12 education and/or home schooling expenses; if your state has these deductions available, you will be prompted to enter them when you prepare your state return.  (As far as I know, the states that offer any sort of K-12 deductions/credits are Arizona,  Illinois, Indiana, Iowa,Louisiana, Minnesota, and Wisconsin)

There is no FEDERAL education credit for K-12. If you're asking about a state credit, you need to identify the state, but, in general, it comes up in the deductions and credits section of the state program.

If you asking about entering expenses for the 529 exclusion, identify as such.