You can do this with the built-in features of your computer's operating system or downloaded software.
To take a screen shot and save it as a picture. Click the window you want to capture. Press "Alt" + "Print" Screen by holding down the Alt key and then pressing the Print Screen key. The Print Screen key is near the upper-right corner of your keyboard.
- Press "Command" + "Shift" + "4" and capture the area with the crosshairs.
- The screenshot saves to your desktop as 'screenshot date time.jpg.'
To capture a screenshot on an iPhone or iPad, press the Home button on the front and the Sleep/Lock button on the top of the device simultaneously. The screen flashes white when done correctly.
Your screenshot will save to the Photos app under Saved Photos or Camera Roll depending on your device.