A Page is added to your plan time-line by selecting the check box associated with those pages you wish to add to the plan and then selecting the Add selected to Plan button.
Ordering of pages
You can change the order that the pages appear in the plan by hovering over the page number in the time-line to the left. Holding down the left mouse button and drag the question into a new position and then releasing the mouse button. The page will then be renumbered and slotted into the desired order in which you want them to appear for the moderator in the group workspace.