Editing the Slide Master
A PowerPoint theme or template specifies the background/design, font, and font size of the presentation as well as other specifics noted in the handout. However, the theme is determined by the slide master. The slide master (or master slide) is the blueprint. You are able to edit the slide master to customize your presentation.
Instructions for editing the slide master start on page 12. Use the PowerPoint example and edit the slide master.
An additional instructional video is available here: