You can take a screenshot on your iPhone without a 'Home' button (X or later) in the following way:
- Press the Side button and the Volume Up button at the same time. Your screen will flash white and you’ll hear a camera shutter sound.
- To locate the screenshot open Photos, then go to Albums > Media Types > Screenshots.
To take a screenshot on iPhone with a 'Home' button:
- Press the Side button and the 'Home' button at the same time.
- Quickly release both buttons.
- Open Photos, then go to Albums > Media Types > Screenshots to find the screenshot you've taken.
To take a screenshot on your iPod Touch:
- Press the Top button and the 'Home' button at the same time.
- Quickly release both buttons.
- Open Photos, then go to Albums > Media Types > Screenshots to find the screenshot you've taken.