OS X Yosemite: Use Launchpad to view and open apps
Represented by the silver icon with the rocket ship, Launchpad is a home for your apps. When you download an app from the Mac App Store, it automatically appears in Launchpad.
Open apps: Click the Launchpad icon in the Dock, then click an app.
Move to the next or previous app page: Swipe left or right on your trackpad or Magic Mouse. Or, press the arrow keys.
Rearrange an app: Drag the app to a new location.
Move an app to another page: Drag the app to the edge of the screen. Release the app when the page you want appears.
Create a folder: Drag one app over another to create a folder, then drag other apps to the folder.
Change a folder’s name: Click to open the folder, click the current name, then enter a new name.
Move an app out of a folder: Click the folder to open it, then drag the app out.
Uninstall an app from your Mac: Click and hold an app icon until all the icons begin to jiggle, then click an app’s Delete button .
If an app doesn’t have a Delete button, it can’t be uninstalled in Launchpad. In Launchpad, you can only uninstall apps you downloaded from the Mac App Store. For more information, see Install, update, and uninstall apps.
Add an app to the Dock: Drag the app to the Dock, then drop the app to the left of the Dock’s separator line. The app is in the Dock and in Launchpad.