1.) To Flip pages back and forward, mouse over the corners of the page, then click on the "curl". You can also use your Keyboard arrow keys, or click on the page numbers.
2.) TO ZOOM IN, Left-click your Mouse. Once Zoomed in, you can move around the page by holding the LEFT MOUSE BUTTON DOWN and drag the page around.
3.) TO ZOOM OUT, Left-click the Mouse again
Close this box by clicking on the X.