#1 Shows the current file size in pixels. The first number is always the width.

#2 I have choosen to resize this 640 X 480 image to 400 X 300. I think that is a perfect size for 99% of eBay auctions. You will have to be the judge of your own pictures. The box on the left, the width, will be highlighted when this screen pops up so you can type in whatever value you want for the width and the height will automatically adjust if you have the (#3) PRESERVE ASPECT RATIO option checked.

Click OK and the image will be displayed in its new size. If you really don't like it click EDIT then UNDO and try a different size.