You can quickly jump to a section or rearrange the page layout by viewing the 'Page Layout' menu in the left side panel:
Jump to a section
To jump to a section, just click on it. You can then begin editing.
To move sections, click and drag up or down. When you let go, the page automatically updates.
Creating page menus
You can create menus by adding a menu 'Web Section'. View the following article for details: