Select this icon wherever you see it to go to the home page, either for WebElements or for the current selection in WebElements.
Whenever you see this icon you can select it to show the periodic table. From there, you can use the full periodic table to select any element of interest to you. In practice, you will need to use this link frequently in order to navigate around the table.
Whenever you see this icon on the menu for an element, select it to hear the name of the element in more-or-less standard English (provided your computer is equipped for sound).
Once you are reading the data of interest to you, you can navigate between elements in two ways. First, use the periodic table icon link (as above) to switch element. Second, you can navigate to adjacent elements in the periodic table from the table of links shown at the top of each information screen.
There are many other features built in to WebElements, but I'll leave them for you to find.