is there something I m not doin right? I called the Intel control, ctrl alt f12, and no 3rd monitor. please advise.
You are correct that your only way to add a third monitor to this laptop is via a USB adapter. Always use USB 3.0 adapters; never USB 2.0. Now, these adapters usually come with a driver CD or a link to a place where you can download the necessary drivers. Did you not get such a CD or link?
Your primary configuration will be through Windows 10 Settings (Settings | System | Display). Whether the driver will come with a Control Panel applet is unknown, since I do not know the one you purchased. I guess you'll find out when it arrives.