Guidelines provide you with a way to align objects on the page. Guidelines are horizontal and/or vertical dotted lines that appear across the page.
Click the Preferences icon, then select the Show guidelines check box on the Preferences pop-up dialog.
NOTE: You can only select this option if the Show rulers option has been selected.
Move the mouse pointer over a ruler and click to insert a guideline.
To adjust a guideline, hover the mouse pointer over the line. The pointer will change to a double-ended arrow. Simply click and drag the arrow pointer to adjust the guideline.
To remove a guideline, hover the mouse pointer over the guideline marker on the ruler. The pointer will change to a double-ended arrow. Click with the mouse to remove the guideline.