Desgning
Using Rulers

It's quick to use the rulers for "rough placement" of objects on the page. A small, dotted line (called a tracking line) moves along the ruler as you move the pointer over the pasteboard and page. The scale on each ruler matches the unit of measure selected in the Preferences dialog box.
You can choose whether or not to display the rulers. You can also move the zero ruler starting point away from the top left corner of the page.