My samsung is set up to screenshot if I swipe my hand across it. But if your isn't it should screenshot if you hit the power and home button at the same time.
Hi tarasgirl06
, to take a screen shot on your iPhone, press home button and on/off button simultaneously.
The other thing you can do is go to Setting > Accessibility > Assistive Touch > turn on Assistive Touch and customize it. Next time just use it to lock screen or take screen shots without going into the phone to look for functions you use often