what is enable pin motor driver tb6600 ?
are enable port in this motor driver = ground ? or that's do other thang ?
Unlike, for example, a brushed DC motor, stepper motors will consume their full current even when they're stationary. The enable pin allows you to cut all power to the motor.
Your pins are marked "EN-", "CW-", "CLK-" where the "-" assumedly means that they have internal pullups. The logic is reversed in that the pins are active when connected to GND. When connected to your Arduino you will need to set the pins LOW to step the motor or enable it.
Protip: always disconnect power to the driver board before connecting or disconnecting the motor.