Perhaps the most efficient way to enter text into your presentation is through the Outline View. To switch to this view, select the Outline tab in the Slides/Outlines windowpane in the left of the Microsoft Powerpoint 2007 screen. From the Outline View simply start typing to add the primary Title text to each slide. Press Enter to start a new slide with Title text, or, if you want to add Subtitle text to your first slide press Tab. Each time you press Tab a new subsection will be added.
Alternatively, when you first open a New Presentation, and when you insert a New Slide, you will typically have a Title Box and a Subtitle Box on your blank slide. Simply click on either box and begin typing to add text.
Additionally, you can insert a new Text Box by choosing Insert > Text Box