Don't leave your legacies ;)

[Majick]

The way I do it is this:

Open a program such as Paint
Open TheSims2
Play!
Take a Picture by hitting Print Screen (Prt Scr) - loaced over the insert/home/page up buttons
Minumise your game
Press CTRL+V to paste the picture in paint

Crop the image by selecting an area of a suitable size (by using the dotted square tool in the upper right toolbox corner)
You can than CTRL +C to copy that section only
Now, from here you can either hit CTRL + Z to erace the original printed image and replace it with the new copied cropped image, or open a new Paint Window, and paste the image into it (easier and a bit less confusing this way, too).

Then, save to a folder (I make a folder specifically for my stories) that you'll remember where it is.  I save my pictures by numbering them -  001, 002, 003, etc., etc.

Then just upload them onto Photobucket or some other image sharing site, and voila.  The rest from there is pretty simple :3  I know it sounds confusing, but it's not so bad.  Just takes some getting used to :3