How to take a picture of your computer ?

Windows 

1. Go on the part you want to print screen it 
2. Find the taste Print Screen or Prt Scr in your keyboard :

3.Open Paint or another pictures program and paste it or Ctrl+V

4.Save it 

Mac

1. Touch tastes Command-Shift-Caps Lock-4  together
2. With your mouse select the part you want to screen shot
3. And the picture is saved on your Desktop