As long as the page you want to move it to is not full, it's easy.
Press and hold any icon on the page that contains the one you want to move. After a while they'll all start to jiggle. Now touch and drag the icon you want to move to the very edge of the screen and, after a second or two, that icon will move to the next screen. You can continue to do this to rearrange icons by moving them from screen to screen. Once you've finished, press the Home button to stop them jiggling.
Wow! that was quick, Thanks Tim