Touch and hold any app icon on the Home Screen until the icons start jiggling
Drag the icon to the new position
Move it to another page by dragging it to the edge of the screen
Place it in a folder by dragging it onto another app icon
Release the icon when it is in the desired spot
Tap Done in the top-right corner or press the Home button if your iPhone has one
To move multiple icons, drag one icon and then tap other icons to add them to the stack before placing them
To reset the Home Screen layout, go to Settings > General > Transfer or Reset iPhone > Reset > Reset Home Screen Layout