At the moment I can focus on an object only when the microscope is virtually touching it. No other position of the microscope will reveal an image, no matter how much I change the focus controls.
I've searched the web to find this, but couldn't get anywhere primarily because this is a localized error or the device you have is faulty. A microscope should operate from a considerable distance. I recommend you download the user guide to see exactly how the software and the microscope can be configured.
You can also get additional information by visiting official website.