First off you can't hurt it.
To get them to work you push the white button up on the dash, labeled “maximum/variable flow” after the seat bar is down and engine is running. A orange light on that button will come on,, for a plow you will want to press it twice to get the second orange light for variable flow mode.
Now the thumb switch on the RH steering lever will angle the plow when you push it left or right. The more you move it the faster the plow should move.
Be sure not to pull the finger trigger on the rh lever while the orange light is on or the plow will go fully one way and keep trying to go further making the engine labour and heating the hydraulics. The trigger is for using a backhoe, brusher etc, that requires the flow locked on. The thumb on is for controling cylinders.
Everytime you lift the seat bar you will have to reset the white button again.
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