The style you use in your presentations is an important part of creating your company's branding, helping people to recognize your work or the work of your company. While you may not be the only one using a particular background or image, people will start to identify it with your company.
To help with this branding, Quizmaker allows you to create your own style either by modifying an existing theme or starting one from scratch. However, this applies just to style elements. You can't add in placeholders for textboxes or images.
You can create a slide master either from an existing Quizmaker file or by starting with a new quiz. You'll need Quizmaker and a question to be open, to be able to enter into the slide master.