Add or Remove Files And Folders On iPad Dock
By default, the only Apps on the iPad Dock are Safari, Mail, Photos and iPod. Adding more apps is easy. Tap and hold an app icon until all icons start to wiggle. Then drag the apps to or from the Dock.
This will ensure your favorite apps are easily within reach, no matter what page you are on. You can keep a maximum of six icons on the Dock.
If you like, move any folders that you've created to the Dock, too.