There's nothing specific about SFML. You just have to add its include/library paths, and link its libraries to your project. That's what you'd have to do for any other C++ library.
If NetBeans is definitely your favorite IDE then you should know how to do these simple things. And if you don't know yet, then you'd better learn how to use it, by searching NetBeans tutorials and not relying on explanations from XYZ library