To remove any icon on that menu bar at the bottom of your iphone just hold down on any icon until the icons start to shake, then drag any icon off that menu task bar and drop it on the screen. That will remove from the bottom bar.
Press home button to stop the shaking icons.
To add you do the same thing. Press and hold any icon until they start to shake, then drag an icon and drop on menu bar. You can arrange them also by dragging them around. Press the home button to stop the shaking and you are done. :)