Hi,
Welcome to the Forum
The output from your receiver will be a pulse signal for a servo unit.
The stepper motor driver you have is not a servo and probably needs a different type of input.
Arduino in the name of the driver means it is suitable for connection to arduino controllers.
You will need to have a programmed arduino between your receiver and stepper driver to accomplish what you need.
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
Can you please post a picture of your project?
Also links to the stepper motor driver spec/data.
Thanks... Tom... 