You can use the mouse or keyboard to access the options within a dialog box. To use the mouse to access an option, simply point to the desired option and click.
The keyboard offers a variety of ways to move between available options:
Press the Tab key to move to the next available option.
Press Shift + Tab to move to the previous available option.
Press the Arrow key to display a current drop-down list.
Press the Enter key to select the current command.
Press the Space Bar to select the current check box or button.