Once the listing has either been manually entered or has been automatically transfered from your local MLS, you simply go to My Listings, click on edit listings and photographs should be about the third option down on your left. Once you're there, simply browse to where you have the pictures saved on your hard drive, and rearrange them as you'd like them to appear. You can also add various captions to your photos to give them that extra Mmmph! Hope this helps!
The Peoples Realtor