If you click on the right half of the screen (or the right arrow) it will flip to the Next Page. If you click on the left half of the screen (or the left arrow) it will Flip to the Previous Page.
On the bottom of the page there is a Control Panel. This will allow you to...
Zoom In and Out
Read the magazine in full screen mode
To exit out of Full Screen Mode, hit the Esc key on your keyboard.
If you choose the three dots (ellipse) on the far right, you will be able to change the screen to Single Page Mode to make it easier to read if you have a small screen. Here you will also find the option to download the magazine onto your device to read later when you have no internet connection.
If you click the +Zoom button It will Zoom in.
If you click the -Zoom button It will Zoom out.
Also if you have a scroll wheel on your mouse, it will Zoom in and out.