Changing the number format
Many more variations are possible. For example, you can set the page number to display in Roman numerals. To do that, you could double-click on the page number and select the desired format; however, a better choice is to specify the format of numbers in the page style as explained here.
In the Styles and Formatting window (press F11 if not already displayed) select the Page Styles icon and right-click on the highlighted entry for the current style. Select Modify, which opens the Page Style dialog box.
On the Page page of the Page Style dialog box, in the Layout settings section, select i, ii, iii, ... from the Format drop-down list.
Variations on the simple page numbering method.