Touch and hold any app on the Home Screen until the icons jiggle
Drag the app to the desired location
Release the app to place it
Tap Done in the top-right corner or press the Home button if your iPhone has one
To move an app to another Home Screen page, drag it to the edge of the screen and wait for the next page
To move an app into a folder, drag it onto another app
To move an app out of a folder, open the folder and drag the app out to the Home Screen
To move multiple apps, drag one app, then tap other apps to add them while still holding the first app
To rearrange apps in the App Library, add them to the Home Screen and move them there
To reset the Home Screen layout, go to Settings, tap General, tap Transfer or Reset iPhone, tap Reset, then tap Reset Home Screen Layout