Navigation within this site
Once you are in a section, if there is more than one page in the section, you will find a menu of sub-sections on the left. Click on any of these to open the sub-section. If there is more than one page in the sub-section, you will see an indented menu of pages below the sub-section title, from which you can select a page.
Near the top-right you will find a Site Map, which shows you the complete structure of the site, which should help you to find the page you're looking for. To the right of the Site Map you will see a icon; pressing this opens up the content (the part of the page below the section menu and to the right of the sub-section menu) into the full window. The arrows on either side of this move you forwards or backwards in the series of pages as given in the Page column of the Site Map.