Traitorfish
The Tighnahulish Kid
How do I show a screenshot here?
Hit the Print Screen key- it's usally abreviated to "Prt Sc" or "Prnt Scrn" or something like that, and will be on the upper right of the keyboard, near the Pause, Delete, Insert, etc. keys- then open MSPaint and use the "paste" command, and save the resulting image as a compressed file, preferably a .jpg. Then use ImageShack or a similar image hosting service to upload the image, get the URL and paste it into the post box on the forum. Wrap it in image tags by highlighting the appropriate text and clicking the icon showing a small landscape picture (with the alt-text "Insert Image" in the command tray. When you post the comment, it should display properly. If it's large, or you have a few of them, it's also worth wrapping it in spoiler tags to minimise space, which you do using the spoiler icon- a small speech bubble with the word "SPOIL" in it, although you'll need to go to the advanced post screen for that.
I'm sorry if that was overly detailed, or if you felt it to be at all patronising, but I wanted to be comprehensive. I always feel it's a little pointless when someone just says "Hit print screen, duh" or whatever, given how very baffling I found that to be when I first went looking for instructions.