Standard Tools
With the 'Standard Tools' toolbar you can execute basic commands like
Create a new web site, Open an existing web site, Save, Cut, Copy, Paste, Undo, Redo.
An introduction to the basic functionality of Web Builder
WYSIWYG Web Builder is a Web site building tool that helps you design and build full-featured Web sites without having to learn HTML. When you startup Web Builder the main screen will look something like this:
It also has icons to insert or edit hyperlinks (9th icon from the left) or add special characters when you're in text edit mode. The last two icons are for previewing and publishing. You can easily add new browsers to use for preview using the 'Edit Browser List' option.
Toolbox
The toolbox can be used to add new objects to your web pages. To insert a new object, select one of the available items and draw a box to indicate the position of the object. The new object will now be inserted to the page. Another way to add objects to your page is by simply dragging them out of the toolbox onto the workspace.
Tabs
When you have opened multiple pages you can used the tabs to switch between the pages. To close the active page press the small 'x' in the upper right corner of the tabs strip.
Workspace
The center of the screen is the workspace, where you can drag and drop objects from the toolbox.
Formatting Tools
The formatting tools are only active when you are in text edit mode.

The Site Manager has its own toolbar to add, edit, clone or remove pages. There's also a button to open the properties of the selected page.
In the picture on the left you see an example of a web site structure. The filename of this example web site is called 'mywebsite.wbs', this name is always displayed at the root of web site tree.
The root can have one of more pages and each page can also have sub pages.
Web sites always have a home page which is often called index, so for this reason Web builder automatically adds this page to each new project.
The names of the items (pages) in the site tree are the actual file names of the target HTML files, so if you named a page 'index' is will publish as index.html.
For more details please read this:
An introduction to the Site Manager
Properties Inspector
Use the Properties Inspector to view and change the properties of selected objects.
You can also use the Properties Inspector to modify page properties. The changes will be visible immediately.
To insert text simply drag the text icon on the workspace. A new object with the text "Double click to edit' will be displayed on the page. To switch to text edit mode double click this text and the formatting tools will become active. For some of the tools you needs to highlight the text before they can be used (just like in a regular text editor).
Related article: Adding text to a web page
Site Manager
The Site Manager can be used to manage the structure of your web site.
The Properties Inspector displays different types of editing fields, depending on the needs of a particular property. These edit fields include edit boxes, drop-down lists, and links to custom editor dialog boxes.
It's also possible to manually modify the size and position of the selected object by changing the Position and Size properties.