Install USB UART driver
Go to https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers
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Download the driver based on your operating system. My operating system is Windows 7 (64-bit).
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Unzip the file and run CP210x..._v64.exe (if your Windows is 64 bit). Run CP210x...v32.exe (if your Windows is 32 bit). Don't know what is 64 bit? Then use the 64 bit version.
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After finishing installing the driver, put in your UART USB to your USB port of your laptop, check the Computer management > Device Manager > Ports, you should see "Silicon Labs CP210x USB to UART Bridge". Your COM number may be different. So remmember your COM number for later section.
Done.