Reordering pages is very easy. Hover over the area in the Draft Pages section just in front of the page name. When you do this, a directional cross will appear. Click and hold the left mouse button and drag the page up or down, when you have it where you want it, let go and the pages will be reordered. If you have already shared these pages, the order will be changed in the Live Pages list and in the shared portfolio, too.