Touch *and hold* any icon until they start to 'jiggle'.
Drag the icon that you want to appear on the new screen to the right edge of the Home or current screen and a new screen will automatically appear. The icon that you dragged will appear on that screen. You move back and forth between the screens by left or right 'swiping' or 'flicking' the screen. You can also tap to the right or left of the row of dots that appear above the dock.
You can have up to 11 screens.
The dots that appear above the 'dock' show the number of screens that you have and which screen you're currently viewing.
Tim
Scotland