Arduino to iRobot Roomba/Create

Being a noob. I am researching this. I have a used Roomba that I am awaiting a battery for and an arduino uno. Anyway before I attempt this I was wondering how do you disconnect the Tx/Rx pins from the FT232 USB-Serial Chip? I have seen this comment twice in my searches but I don't know how to disconnect anything that is on the Arduino.

Thanks

Tom