Currently Being ModeratedJul 25, 2013 10:46 AM (in response to Bereanone)
What you're looking for is a shape. Shapes are often confused for text boxes that have a height. There is no textbox that has height. Shapes allow you to have text inside them and change the height.
Currently Being ModeratedJul 25, 2013 11:48 AM (in response to Bereanone)
Inspector > Slide > Appearance
click in the selection box to add either a title or body text box to the slide