There are several ways to delete the app.
1. Go to the Finder menu and choose Applications on the left hand panel. Find the application you intend to delete and press Command+Backspace or simply drag and drop the application icon to the Trash.
2. Go to the Launchpad (either with the icon in the dock or by pressing F4 button on the keyboard). Being in the Launchpad menu press and hold the Alt button on the keyboard. Icons of applications will start shaking and there'll come up a cross symbol next to each icon. Click this cross symbol to delete an app.
PS You may be requested to enter your computer administrator's password in order to finish the procedure.