I know that I'm probably missing something obvious, but I was getting my Teensy from Amazon (a verified distributor), and they don't have overnight shipping on the pre-soldered, and I'm bad at soldering so I was going to solder as little as possible and run a jumper cable to my breadboard. My FTDI Basic clone is self-powered (which caused me much confusion when learning that the Arduino somehow turns on when applying 5V to 5V, even though it needs 7V of power and has a seperate VIN pin...), so needs 3 pins: DTR, which I connected to GND based on a suggestion on the Arduino forums, RX, and TX. I can't figure out if I connect RX/TX to D3, B3, some other letter-3, or there's just a plain old 3 that I'm missing. Does anyone know which one it is?