Since there is no practical information about this product or about its support software, I can't really say what is the correct way to connect to the device. Typically, the drivers should have some sort of a manual to be able to install and connect. After you installed them, go to the installation folder and look for PDF or CHM files. These are the ones that usually contain the necessary information.
I also tried to download the APM303 USB Drivers, but failed since no other download is available.