Hi, tc. Nice to "see" you here again.
As anti says, there's quite a bit available on the internet. This looks like quite a nice little pictorial guide:
http://www.wikihow.com/Take-a-Screenshot-With-an-iPad
As far as I can see, you simply press the Sleep/Wake button and, while keeping it pressed, press the Home button briefly. (Hold them down too long and the device will shut down. I think.)
Let us know how you get on.
