Rex,
It should be the on the right-hand side of the Key Board, next but one to Delete; Insert; then you should see, "Print Screen System Required", Pause Break on the right, this is on a Desk Top Keyboard. I think sometimes it may be identified by "PSSR";
On Laptops, some have a key & some do not, they probably have a Double- Function Key somewhere, you can always plug in a USB Keyboard with the PSRS KEY on it, to get the Function to work! I don't really use Laptops that often, I have always preferred a Home built Desk top that I can upgrade as & when necessary.
Cheers
John