A
placeholder shape is an ellipse, rectangle, or polygon that appears
in the document window with an X, indicating that it should be replaced
by text or an image later.
In the toolbox, select the Ellipse Frame tool , the
Rectangle Frame tool , or
the Polygon Frame tool .
Drag in the document window to create the path or frame.
Hold down Shift to constrain the width and height of the frame.
You can change the crop amount, reference
point, and other fitting options for a placeholder frame by choosing
Object > Fitting > Frame Fitting Options.