Beginner need help with Logic Level Converter - Single Supply

I need help on how to wire the logic converter.

I am trying to use a laser range finder that work with 3.3 V with pixhawk flight controller which work with 5V. So if I connect the laser directly it will be burned and damaged.

So I bought the SparkFun Logic Level Converter - Single Supply

Now correct me if I am wrong.
it looks like the power wire from pixhawk goes to vin 3-5 voltage and gnd below it. Then vout 3.3 and gnd to the laser.

But what about the TX and RX ? How do I wire those ?

Thank you