I have just tried taking a screenshot on the Optimus Elite and I couldn’t find a way to do it.  The closest I got to taking a screenshot with it was when I tried holding both volume buttons and the power button.  I noticed a message say “current screen cannot be captured”. You are better off downloading an android app to do this, than try and figure out how to do it on the phone itself.  You will only get frustrated like I did. Here is an app I would recommend.  It’s called Screenshot Ultimate, and you can download it from the Play Store. https://play.google.com/store/apps/details?id=com.icecoldapps.screenshotultimate&hl=en

Screenshot Ultimate

take a screenshot with this app on your phone