I have several 529 accounts for my young grandchildren. I am wondering if I need to report these accounts to the irs as a part of my taxes for 2024. If so, how do I do it???

My 529 information does not appear on my federal return, only on the state return (where the 529 donations are tax deductible).

No, 529 plan contributions are not deductible on your federal return, so you don't need to enter anything about them on the federal return.   Some states allow a deduction.  If yours does, you can take the credit on your state return.