The TOP MENU BAR will give you access to the individual subfolder webpages just by hovering over the links. Hovering over a menu link with two right carets on the right will open the next level of webpages.
Use the "Bread Crumbs" links at the lower left of the webpage to navigate quickly back up the folder system. In the example below, the webpage currently displayed is the "Census Lesson". If I wanted to go back one page, I would click on the link "Census Records". If I wanted to jump quickly back to the top folder, I would click "Discovering Family History Work".