If an application is not responding, you can use the Dock to force quit it. One of the options on that context menu will allow you to Quit the application.
To quit an application, you can click and hold the pointer over its icon until a context menu is displayed. To launch an application, all you have to do is click on its icon in the Dock. The dock offers a quick way to launch and manage applications. The dock is the bar of icons that usually appears at the bottom of your screen.
