For simple images in Swing just read them into an ImageIcon and pass that to a JLabel. You now have a JLabel that's the same size as the image, containg the image, and you can position it using LayoutManager of your choice. The GUI builders in the big IDEs are more likely to confuse than help for such a simple task, especually if you don't have much Swing experience.
and especially if it's the one implemented in NetBeans.
the code is hard to read, and, unfortunately, very irritating to maintain/update without introducing regression bugs.
This makes NetBeans Swing code a bad idea when you're talking about
a: a professional project
b: a UI that might ever need to be changed/updated