please tell me how to post a screen shot i want to share something. i tried the prnt screen and paste but nothing happend
With Win7/8 (maybe XP?), use the snipping tool that is built in. Just search for snip and it should be the first thing. It's REALLY easy and you can select exactly what you want to screenshot.
On a Mac, Command + Shift + 4 to select a specific region-saves to desktop.