In order to change the margins in a document you need to change the
master pages.  (Note: look at the PARAGRAPH FORMATS answers for
information on changing the margins for a paragraph as opposed to the
whole document) 

First select Master from the Page menu.  You will see a blank page
with outlines of boxes, as well as any header/footer/graphics you may
have on the page.

Select the text column for which you wish to change the margin
(Ctrl-click).  You will notice that the select box has small black
squares all around it.  To move the edge of the column move the mouse
over one of these black boxes.  The mouse pointer will change to an
arrow pointing in the direction of the edge. Click the left button and
slide the edge until you have it at the desired side.  For accuracy
there is a reference line that moves along the top of the ruler.

Once you have changed the margins of a text column, you need to apply
the change to the appropriate pages.  Select Body from the Page menu,
and then select Column Layout from the Page menu.  In the new window,
choose to Apply the Master page you just editted, to either:

	o  The current selected page
	o  All right pages in the document
	o  All left pages in the document
	o  All pages of the document
	o  All pages currently using a specified Master page

Then click on OK.  If you scroll through the pages of your document
you will see that the changes have been applied.