After the Mac App Store opens, users can search for apps by name or keyword, browse for apps by category, view 'new and noteworthy' apps or check out staff favorites. To open the store on a computer, click the Mac App Store icon on the computer's desktop dock. The Mac App Store is similar in appearance and function to the already-existing App Store on iPhones and iPads. When the installation is complete, you will need to restart your Mac and launch the Mac App Store from the icon in your computer's dock. To get the Mac App Store, click the Apple icon at the top left of the screen, then choose 'software update.' After a dialog box appears, click the 'install' button.
The Mac App Store is compatible with OS X Snow Leopard (version 10.6) and available for free download when you upgrade to OS X Lion. If your Mac is running an older operating system, you may still be able to download the Mac App Store.
Simply look for the Mac App Store icon, which is a blue circle with a white outline and an 'A' in the middle. The Mac App Store is preinstalled on Macs sold with OS X Lion (version 10.7) operating systems.
