Final answer:
The nurse should write notes in the Notes Pane, the white space under the slide portion in PowerPoint, which helps the presenter during the presentation without being visible to the audience.
Step-by-step explanation:
When preparing a presentation using Microsoft PowerPoint software, the nurse should write notes to remember what to say for each slide in the white space under the slide portion. This area is known as the Notes Pane, which is specifically designed for this purpose. It allows the presenter to jot down reminders, talking points, or any other information relevant to the slide that can help during the presentation. These notes do not appear on the actual slide during the presentation, thus they can be quite detailed without affecting the audience's view of the slide.