Simple Campaign Builder
When using the simple campaign builder, your pages appear as a list. To change the order of the pages, simply click the arrow above or below the page number to move the page up or down the list.
Advanced Campaign Builder
On the advanced campaign builder, you will have a bird's eye view of your campaign where you can click and drag components to move it's positions. The order of the components would depend on the arrows connecting the components together.
Drag the arrow from one component to another to connect them and click the delete button in the middle of the arrow line to delete a connection.