Okay, I found the control for adding color to the entire background.
I was just reading about how to resize the image, though, and I don't seem to be able to do that.
Here's what you wrote to someone else:
just grab the lower right corner of the entire window with the mouse and click and drag.
(the cursor should change to a diagonal two headed arrow when you move near the bottom right corner to show that the window can be resized by dragging).
I've tried that without success. I'll go try again and see if anything changes.
ETA: Nope. When I move the cursor around in the area of the lower right corner of the text window, nothing happens. The cursor remains an ordinary arrow cursor. I'm using Windows 7 (and Firefox 3.6.x, although I don't suppose that matters). Can you help?
ETA: But wait! I understood window to mean the "text window", or the place where one enters text. You meant the application "window." And yes, applying that definition, the arrow does change and I can change the shape of the image. Very, very cool!