How to take a screen shot on a Blu Vivo XL3 Plus

To take a screen shot on a Blu Vivo XL3 Plus, hold down the Power and Volume Down buttons (both on the right side of the phone).  The screen shot will be captured after a second or two.

Another method for taking a screen shot is to swipe down the screen with three fingers.  If it's your first time doing that, you'll see a confirmation message like this one:

Tap the "Don't show again" box, then tap "TURN ON IN THE SETTINGS" to enable the three-finger screen shot option.