1. Page tree

The simplest way to work the site is by help of the so called "page tree", which looks like this:

If you cannot see the page tree on the screen, press the Page button in the main menu on the left side:

Please note that it makes quite a difference whether you press Page, Show or List - these are 3 different ways to see the contents of the pages and what they contain (functions/elements).

These are 3 different ways of see the contents of the pages and what they contain (functions/elements).

In most cases Page is the best as you usually are only changing content.
List is good for looking at a list of users in an address list.
View lets you see the page on the right side.