Installing FengGUI/JGN with Netbeans

How do I do what is stated above? FengGUI has a .JAR, but when I tried just putting it in jME's src/com/jME directory it didn't work, with linking problems. Any idea how to do this?

Right-click on your project, then click Libraries, then click "Add Jar/Folder," add the jar and you're done.