How do you post screenshots of this game to miiverse?

Found the answer on neogaf since the gamefaqs community appears to be too elite to answer faqs anymore. (talking about the forums here)

"You can't "take a screenshot," per say, in that you don't first capture and save it anywhere. What you do is, when you want to share a screen, hit Home when the game is showing what you want, go to make a Miiverse post, and the image attach button will be prepopulated with whatever your game was showing when you hit Home."