Privacy settings are found in the Settings App. Close what ever app you are using and look for the grey icon that says "Settings" on your home screen. Open Settings and then find Privacy, then Photos.
Press and hold the devices Home button and then click the On/Off switch. You should hear a camera shutter sound if you did it correctly. The screen shot will saved to your Camera Roll accessed via the Photos app.
Press and hold the screen On/Off switch at the top of the device for a few seconds until a power slider at the top appears. Slide the button to the right to power down. Wait a few seconds for the device to shut down completely. Now press the screen On/Off switch for a second or two and then release to power back on.
First close the app by pressing the devices Home button (the round button with the square in the middle). Now double tap the Home button to open the Task Manager. Find the icon of Pic Stitch in the Task Manager. Touch and hold the icon until a red button with a minus sign appears. Tap the red button to completely exit the app. Touch anywhere on your devices home screen to close the Task Manager.