A cell is a container that holds something: usually a graphic image or a body of text. When you start a new page, there is a single empty cell. To create a new cell, click on the button on the toolbar. (The words "Empty Cell" will appear in the Design Environment, to help you identify the cell you just created).
Normally you will not see the borders of a cell until you use the mouse to move the cursor over the cell's area. When you do, you will see the cell with a light gray border (note this color can be changed; see the "Default and Behavior Options" section of this documentation).
The picture below shows two empty cells. The cursor is currently over the cell on the right; you can see its gray border, but not the border of the cell on the left:
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