How did you do that?
It's a little tricky. You take 2 other apps (use 1 that will most likely share the folder with Newsstand). Drag 1 app onto the other app. While its in the process of creating a folder, drag the Newsstand app into the newly forming folder. Boom, it's done.
However, when its in the folder DO NOT select it. It has been known to crash the system.