It's basically the same way you created folders. Touch and hold any folder or app icon on your iPad's screen (keep your finger on it). In a moment all of your icons and folders will all begin to mildly shake. At that point you can touch and drag any icon or folder anywhere you want...putting them in whatever order you'd like. If you want to move something from one screen to another simply drag the icon or folder to the appropriate edge and in a moment the next screen will slide in. Once you have them right where you want them press the home button and they will remain in place.