adding an image folder to a project

I'm trying to add an image folder to my java project in WDSC (5.0.1) and
can't seem to figure out exactly the right way to do so.  Am I supposed to
create a new folder, import from an existing folder, or something else?  I'm
trying to run thru a tutorial that creates a gui app that needs the images.
According to the tutorial, I'm supposed to put this image folder under my
source folder which is set up as a package under the project folder of the
same name.

Also,  why can't I see all files in folders that already exist that I've
added to my project?

If someone could point me in the right direction that would be great.

Thanks