Hello Carmen,
I took screenshots from the iPhone. To do this, just click on the Home
and Sleep buttons simultaneously. The iPhone screen will flash and you
will hear a camera shutter sound. To view the photos, just go to the
Camera Roll section of the Photos app of your iPhone. These pictures
can also be imported into your computer just like any photo you have
taken. By the way, this also works on an iPad as well.
Hope this helps.
Robert