For a Mac, you create a screen shot by........
1) (Obvious) Having something like a picture, a website, or something like that you want to remember to make a screen shot of :)
2) Hold down the command button, the shift button, and the #3 button at the same time.
3) You can see your screen shot on your desktop! :)
If you are using a PC, use the snipping tool to capture a screenshot
For Windows XP, pres the "PrtSc" button (probably located at the top right of your keyboard). This will put the screenshot on your clipboard; then you can go into Word and paste it onto a document, and you're done!
On a pc, push prt sc. Then paste onto a Word doc. Save file, then attach doc. to discussion.