When you click on one of the sections in the navigation menu on the left you will be shown that section's main page. When you have finished viewing that page, look back in the left-hand menu to see if other items are available in that section.
In this case, we click on the "Board of Supervisors" section and find that there are sub-sections for Functions, Members, etc. If you click on one of the sub-sections you will be shown that page.
Keep returning to the left-hand menu to see if there are additional sub-sections to visit.