oddWires Arduino Robotics Kit With Motor Shield Manual page 10

Selecting an Arduino Uno
Select your serial port
Select the serial device of the Arduino board from the Tools > Serial Port menu.
Select the serial device of the Arduino board from the Tools | Serial Port menu. On Windows this is likely
to be COM3 or higher (COM1 and COM2 are usually reserved for hardware serial ports). To find out, you
can disconnect your Arduino board and re-open the menu; the entry that disappears should be the Arduino
board. Reconnect the board and select that serial port.
On the Mac, this should be something with /dev/tty.usbmodem (for the Uno).
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Your First Arduino Sketch Arduino Robotics Kit