Use the master slide navigator and the Master Slide inspector to work with master slides.
Open the master slide navigator by clicking View in the toolbar and choosing Show Master Slides.
In the master slide navigator, select a master slide.
See About Selecting Master Slides to Customize for more information on selecting master slides.
Click Inspector in the toolbar, and then click the Slide Inspector button.
To modify layout and background attributes, click Appearance.
See About Customizing Master Slide Layouts for more information.
To add or modify transitions between master slides, click Transition.
See Defining Default Transitions for more information.