1. Press Prt Scrm(Print Screen)
2. Go to start open up all programs look for paint
2a. If you don't have paint http://www.getpaint.net/index2.html Paint.net
3. Copy and paste it (Ctrl + V or Shift + Insert)
4. Blockout stuff you don't want other people to see(Or cut and paste)
5. Save into JpeG
6. Host it in http://imageshack.us/
7. select the bottom most link
8. Click insert image and paste the link
9. Walla