"Use as separate display" actually extends your display space so you'll need to grab whatever it is that you want projected and drag it into the extended display space.
If you're connected to another source (a second monitor, a projector, etc) you should have choices - "Mirror Retina Display" will "project" the same thing that's showing on your Macbook. Next you'll find the display preferences. You'll see the searchlight magnifying glass, to the left of that you'll see your user name, the time, date and day are to the left of that, the battery indicator to the left of that, then the speaker symbol. 1) Look at the very top of your Macbook display - up in the top, right hand corner. You've got (at least) two ways to deal with this. What's happening is that one of your primary (selected) desktop is being shown on the Macbook's display and one of your other Desktops is shown on the projector. With this adapter, you simply load the drivers, plug in the adapter to the USB port, then plug in the VGA monitor cable into the adapter and. Theres no need to open up your computer to add an expensive video card. It allows you to add an additional VGA monitor/display through your USB 3.0 port.
Having your background only displayed is an entirely different (and much easier) issue to solve. The JUA310 USB 3.0 VGA Display Adapter acts as an external video card for your Mac® or PC.
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