Explanation of the "User from Node" step
I'm having trouble in chapter 5.1.2 and I think it may be down to the "User from Node" step. Although I understand how to carry out your instructions I don't understand how Drupal knows what I mean by "User from Node". i.e. how does it know to copy the UID from the Node ID? Is the phrase "User from Node" a kind of syntax that Drupal understands or do I have to include that functionality somewhere else? If so where?
I hope that made sense!