The best way to do it is to open edition on the Pages main tab, and then edit each master, changing the layout properties.
1.Run Fred4 and then on the navigator of the Pages navigator, click Masters.
2.Select a title and edition, and then click the refresh button
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3.Double-click a master to open it in a new content tab.
4.To edit master dimensions, on the Layout menu, click Master Setup and then on the Geometry data dialog box edit what you want.
5.To change the format of the local texts for that master, on the Layout menu, click Master format, and then select the format.
6.To add design elements, e.g. folio, fixed standing art, fixed local text, etc, use the same steps as when designing pages. Note: don't put articles on the masters.