I haven't played with too many humidifiers yet, but here's what I know.
Humidifiers are fairly simple in general. You want them to run when the heat is going. They are usually turned on by a 24VAC signal to the humidifier water valve solenoid, which is powered by the furnace when it turns on. The digital humidifiers will take this 24VAC "furnace-on" signal as an input, and then feed the voltage to valve separately.
You need to get the install instructions to your furnace, install instructions to your furnace control board, and the install instructions to the humidifier, and figure out how to make that happen. Some control boards have a dedicated humidifier output, but make sure it is the proper voltage for you humidifier. If you put 120VAC to a 24VAC input, it will blow up something!! Something like a Control board, solenoid valve, or wire??!!!!