That is only if you are using a Ruida controller to drive a diode laser. Mini Gerbil does not have this option.
For the diode you have, you should contact Awesome Tech to see if they have guidance for where to connect the outputs. I suspect you’ll need to connect both the TTL (on/off) pin from the laser and the PWM (power level) to the Gerbil board, but I don’t know enough about that hardware to know where those connections would go.