At the bottom of your iPhone or iPad screen are a series of
icons that appear on every screen you switch to. This is consider the dock
and can be used to hold your most used applications so that they are easily
accessible from every screen. There is a limitation, though, as to how many
icons you can dock at the bottom of the screen without using special apps.
For the iPad you can dock 6 icons, while for the iPhone and iTouch you can
dock 4 icons. This guide will explain how to remove and add icons to the dock
so that they are accessible from every screen you are viewing.
Method 1: How to add an app to your dock through the
iPad or iPhone
In order to move icons to your dock you need to press and hold
an icon until all of the icons start to shake. Once you are in this mode,
you can simply drag the icon to the dock at the bottom of the screen and let
go.

Add an app to the dock on the iPad
Then press the Home button to stop your icons
from shaking.
To remove an icon from the dock works the same way. Simply press
and hold the icon and drag it out of the dock back onto your screen.
Method 1: How to add an app to your dock through iTunes
You can also add icons to your dock through iTunes. Simply start
iTunes and under the Devices category, click on your device
name. You should now be at your summary screen. Now click on the Apps
tab so that you see your list of apps as shown in the image below.

Adding an app to the dock through iTunes
To add an icon to the dock, click on the screen where the icon
you want is located and then drag it to the position on the dock that you
want it. To remove an icon from the dock just drag it off the dock to somewhere
else on the screen. When done making changes, click on the Apply
button. The next time you sync your iPad, iTouch, or iPhone the changes will
appear on your device.