There are existing apps that are located on your home screen. To rearrange them, simply tap and hold the app icon, then drag it to the desired location. If you wish to remove an app from the home screen, tap and hold and drag it to the top of the page where the "Remove" text is displayed.
You can also add additional apps to the home screen. Simply swipe upwards to view all apps that are either pre-installed or previously downloaded. If you want to access specific apps directly from your home screen, tap and hold the app icon, then drag it to the desired location.
Note: the home screen can have multiple pages, with access to each by swiping the home screen left and right.