Basically, you just click your mouse (left button for PC's) on the buttons or links (like this blue underlined text) to move around wherever you want to go.
To scroll up and down through pages that run off the page, either use your mouse and the up/down arrows that appear along the scroll bars that appear to the left (or below) the page, or use the arrows on your keyboard.
Other basic tricks you might have use for are these: