It's really easy to take a screenshot of your screen on the HTC EVO 3D phone. These instructions might also work for similar phones like the HTC Evo Shift 4G and HTC Evo Design 4G; try it and find out.

How to take a screenshot:

  1. Hold down the power button on your phone
  2. While holding down the power button, touch the "home" button.

That's it, just simultaneously hold down the power button and the home button and a screen shot will be created. A message will flash on the screen saying that the screenshot has been saved to "Camera shots", but I've found no such folder on my phone. Instead, I've found all screenshots I've taken on my phone to be saved in the /mnt/sdcard/DCIM directory.