Connect your RX and TX cables to the communication jumpers, as described in our manual (page 10):
Open Jumper 2 and Jumper 3 and connect the left side of MOVI's TX jumper (Jumper 2)
and the left side of MOVI's RX jumper (Jumper 3) to two other connectors. The left
side is the pin that is further away from the Arduino headers and the microphone (MIC1)
and closer to the button.
Then use a terminal program (like putty) and choose a bitrate of 9600bps.