In super lame man terms where do i paste this
(Posting here as well so anyone wondering the same thing can get an answer.) Ideally it should go just before the </body> tag at the end of the page. With things like forums and blog software you'll probably want to edit some sort of "footer" template. If you don't find a </body> tag, don't worry, just place it as close to the end of the page as you can.
Is it possible to get this to work on a Proboards site? I listed some of the items for FFXIV, and I'd like to have the tooltips show up.
I'm not sure, as I'm not familiar with them. Looking at their site it appears they host the forum software for you, so you may not be able to do this. See if in their forum setup area there's anywhere you can add custom code if my instructions immediately above don't work.