[Frankie]

paste the screenshot in paint.
use the 'select' tool to select which part of the image you want to use.
right click, copy
open a new paint (faster than clearing out the current one you're in) and paste. make sure you crop out any extra white part in the image.

paint should be letting you save as a .PNG file. don't type it in the file name. type your file name without an extension, then select what file type to save. if your paint won't let you save as .PNG then that's really weird.