I want to use some of the brushes in the brush library but it seems like you have to use the paint brush tool to use them, and I don't have one. I can't find anything on how to add it. All I've got is the classic and fluid brush tools.
The closest thing I've seen to a similar issue like mine was a post saying that someone had to "add it in themself" without any explanation. What can I do to get the tool?