Sorry for the problem. I'm not sure what the issue you had was. The Raspberry Pi only has one serial port connection on the connector. Transmit is on pin 8 and receive is on pin 10 of the Raspberry Pi connector. See the pinout on this page -
If it's the serial port on your computer that is the question then we gave the information on how to run Device Manager (assuming you are running Windows on your computer) on our documentation page.