How to use braking in this DC motor control system?
This question appears to be about how to use a product rather than electrical engineering theory or design. The product appears to be intended for use with a brushed DC motor. A brushed DC motor can be braked by first removing the armature voltage and then connecting a resistor across the motor armature. The resistor must be selected to be suitable for the motor voltage and current rating and the kinetic energy to be absorbed from the load. A suitable controller (not this one) can control the use of the braking resistor. With this controller, you must design an external brake application system.