To reorder your drop down menu, go to "Design Editor" and click "reorder" next to "Drop Down Menu".
Note: Not all templates have drop down menus.
Now choose which pages you want to appear in the drop down menu, by moving them to the right or left using the arrows in the center.
To reorder the drop down menu, move the pages up or down using the arrows on the right.
When finished, click "Save Changes".