You just hold the homebutton, and click on the power button. (you will make a screenshot)
Go to your Photo's/Picture library (scroll down and you will now see your screenshot)
Connect the ipad with your PC or Laptop. Go to (internal storage > DCIM > Click another map (random file number) > You will see all your pictures in your PC/Laptop.
Now right mouse click, Copy picture and paste them in another folder you prefer.