How to take a screenshot on a Computer.
Using Window's Print Screen Function
Open the Windows you would like to take a picture of and hit "Print Screen on your keyboard" (Marked with red)
Note: If your the Print Screen keys are a different color or it's below other text you will need to hold the Function button while pressing the print screen button (Marked with Blue)
Open an image editing software or email client and hit CTRL + V to paste the Image into the Software.
Using Window's Snipping Tool
Open the Snipping Tool and hit "New"
Your computer will then have this white tint to it's screen. At that point drag a box around the part of the screen you would like to capture
A window will then appear that gives you the option to copy, email and save the picture. There are also tools built in to edit the picture.