The problem you are probably running into is power consumption. The board can
not supply enough current to run a stepper motor.

You are going to need to setup a driver board to amplify your signal (I'm
assuming you know how to produce the correct signals from your board to run a
stepper, yes?)

So basically, here's the deal...

The board can speak the language that the stepper needs to hear, but it speaks
very softly and the stepper is hard of hearing. Drivers can act like
megaphones...they don't change what the board is saying, they just make it a lot
louder.

The board will output a 5V signal at low current. User drivers and an external
power source to boost the voltage to meet the specs of your motor. Also, the
external power source should be able to supply the needed current.

Sourcing too much power through a Dragon12+ board can break it! If this is too
much for you to handle, ask someone for help! If you want a suggestion on
drivers you might consider...look at L289's! They are very useful and easy to
utilize.

Good luck.