Attaching effects to a model

Ok, first off, I have searched through past posts to try to find the answer to this newbie question...

I want to attach an effect to a demon hunter model, kind of like how the Bloodmage always has his spheres. Ideally I'd want a ball of lightning or something like that. But I can't get anything to stick to him!

If someone could just tell me the exact names of the fields I need to change in the unit editor, that would really help. Or, if the only way to do it is by editting an ability like Sphere, what, exactly, needs to be changed? I've played with it for a while and can't make it work.

Special effect - create special effect on unit

is that what you meant?

If you wanted the special effect to be like bloodmage styles, where they move and go all swirly etc, you should base an ability of the the " sphere" ability, change the effect to whatever, and then give it to your hero.