All the top level pages are displayed automatically in the side bar. You can create a new page and make it appear in the sidebar by making its parent page the home page.
If you wish to re-order the site bar you need to visit the 'sidebar' page e.g. https://www.dr-toolbox.com/XXX/SideBar (where XXX is your hospital code, note the capitalization, uppercase S and B in SideBar)
Move the list items up and down, then press "Save sidebar".
Note that after the sidebar is manually reordered:
1. Any subpages newly added to the home page will appear alphabetically *after* the manually ordered pages.
2. Changing a title of a manually ordered page doesn't change its place in the sidebar.