From the Administration Panel, select Edit Catalogue.
The listing order of categories can be changed by moving them up one level at a time. Top level categories can be moved in relation to other top level categories. Sub-categories can be moved up relative to other sub-categories, but not from one top level category to another. The same is true in reverse. Top level categories cannot be moved into a sub-category position.
To change the order that a category appears in the list, click on the Move Up button.