Look for a file titled Screen shot followed by the date.To find the screen shot file, go to the Desktop (click on the Finder icon and then on Desktop in the Places menu).After you draw the box, the picture will snap (if your volume is up, you’ll hear the sound of a camera shutter clicking).You’ll see a cross-hairs cursor appear, which you can use to draw a box around the portion of the screen you want to capture.To select a specific area of the screen, press these three keys at the same time: cmd shift 4.See below for how to find and edit the file.If your volume is up, you’ll hear the sound of a camera shutter clicking.To take a picture of the whole screen, press these three keys at the same time: cmd shift 3.