On the Donate to New Jersey's Special Funds screen, if you check on Yes, I'd like to donate, it will give you a list of all possible funds you can select to donate.
You do not have obligation to do so but the funds received works to improve the quality of public policy decision-making on the most significant issues affecting the people of New Jersey and the region. Please also note that the donation will reduce your refund or increase your balance due.
Please see attached screenshot of the list of the funds ( Click on the drop-down menu for more options)