Let's see...
Regarding magic applying to any action, I'd say you can simply treat it as a normal action roll and "flavour" it like you're using magic, but you don't gain any additional benefits, and your impact/control with it is limited. For example, you can use magic to hide yourself, but you cannot become fully invisible or undetectable. You can use magic to push someone back, but you cannot push away a whole crowd of enemies or accurately control where they go.
Regarding Change, maybe there's a lapse in the wording there. Basically it means there is added Risk, so the number of successes required from is increased.