How to change the slide master or master slide in PowerPoint (2007, 2010, 2013, 2016)
If you want to save time with your PowerPoint presentations, consider modifying the slide master. You can make the change in one location and the changes will be automatically be applied to all the slides of the same kind in your presentation. Tweak your graphics, fonts, bullet lists, backgrounds or anything you want. It is that easy. See the video below on how it is done.
If you would like to learn more about PowerPoint, check the full tutorial from here.