1. Hit SHIFT + PrtSc (Print Screen) - that will take a screenshot of your display.
2. go to Paint and CTRL-V, to paste it into the application.
3. Reduce the size of the surrounding image so that it shows only what you want to show.
4. Save it into a place you can find it easily.
5. Go to Tinypic.com.
6. Choose the image you want to upload
7. Set size of the image to 17" in the Resize dropdown box.
8. Copy the code in the box that says "IMG Code for Forums & Message Boards". It will look like [IxG]http://i39.tinypic.com/xxx.jpg[/IxG]
9. Paste the code into the post you want it and its done.