The Toolbar is the area in page editor where you can activate most of the editor features. Each button in the toolbar accesses a different function. There are simple functions for basic text formatting and more advanced features for items like creation of links and tables.
To use the buttons in the toolbar you must move your mouse pointer over the button. The button will get highlighted and a message with the information about the button function will appear. Click on the button to execute its function. With more experience you will have full control over all Page Editor features and you won't have to read the description of the buttons. You will just use them intuitively.
Besides the toolbars buttons there are also toolbar combos (drop down boxes). The combos are the white areas with a little arrow on the side. They can be easily accessed by clicking on the white area or the little arrow. Once clicked, the menu will expand so you can choose from one of its available options. To execute one of them, simply click on it.