Sometimes a picture is worth a thousand words and is the easiest way to share your question/problem. OS X makes it easy to take a picture or your entire screen or a portion of your screen. Here's how:
Take a picture of your entire screen
You can take a picture, or screenshot, of your entire screen using Grab.
1) Launch Grab (located in the /Applications/Utilities folder).
2) Choose Capture > Screen.
3) When the Screen Grab dialog opens, click outside that window. Grab captures the screen within a few seconds. A new window appears with an image of your entire screen.
4) Choose File > Save and save the screenshot to your Desktop.
5) Attach the screenshot file on your Desktop to your support ticket reply.
Take a picture of part of your screen
If you don’t need a picture of your entire screen, you can capture just part of the screen.
1) Launch Grab (located in the /Applications/Utilities folder).
2) Choose Capture > Selection.
3) Move the pointer to a corner of the area you want to capture.
4) Drag the pointer across the area and release the mouse button. Grab captures the part you selected within a few seconds. A new window appears with the image of the selected area.
5) Choose File > Save and save the screenshot to your Desktop.
6) Attach the screenshot file on your Desktop to your support ticket reply.
Shortcuts
OS X provides keyboard shortcuts for taking a picture of the screen or part of the screen.Pictures of the screen (screenshots) are saved as files on the desktop, but if you prefer to put a screenshot in the Clipboard, hold down the Control key while you press the other keys. You can then paste the picture into a document.
• Take a picture of the whole screen: Command (⌘)-Shift-3
• Take a picture of part of the screen: Command (⌘)-Shift-4, and then drag the crosshair pointer to select the area. Continue to press the mouse button, release the keys, and then press Shift, Option, or the Space bar while you drag to resize the selection area. When you are ready to take a picture, release the mouse button. To cancel, press Escape before you release the mouse button.