How to move the keyboard up and down?

Make sure that Split Keyboard is turned on as well - Settings>General>Keyboard>Split Keyboard>On. Then after you do as suggested above, hold down on the icon to move the keyboard up and down on the screen.

Call up the keyboard so that it is visible. At the very bottom right of the keyboard is an icon that looks like the keyboard with a down arrow. Touch and hold the icon and a small popup will appear giving you the choice to undock(move it up to the middle of the screen) or split it. If you do either one on those options, you can put it back where it belongs by touching the icon again, and selecting dock.