I don't believe there is a 'owner' on this action. You have to load the object inot a variable first.
Yes, actually you will need this a lot if using prefabs. You'll need to be able to point to something. On youtube they have a video tutorial about this on the playmaker channel.
You need to create a global variable. In the global variable you link it to the object. then in the state, you point the variables together. See pictures.