The combination of the buttons reminds us that the combination used in Apple for the iPhone, the only difference is that the buttons are distributed differently.
Having prepared the screen that you want to capture.
Keep pressed the start button (the center button) and power simultaneously.
After a second holding down these buttons, the outside of the screen flashes briefly accompanied by a shutter sound to know that the screen capture was successful.
Having gained the screenshot, we can find in the Gallery application, or My Files, the file browser of Samsung.
We can also share directly with other applications from the Share button in the notification screen.