how to add Facebook Donate Button to NGO Facebook page

I am attempting to set up a donation page on Facebook, using the nonprofit template. I want to enable my page to incorporate the "Donate" button. According to the following resource: https://donorbox.org/nonprofit-blog/facebook-donate-now-button/, I need to select Edit Page Info, then add Nonprofit Organization as a category in order to enable Shop with you or make a donation under +Add a Button. This is apparently supposed to give me access to an option for a Donatebutton. Even after adding that category, I am still not seeing Donate as an option. What else must I do in order to enable access to the Donate button on my page?