One of the deliverables for part II is "Create either a Sequence or Collaboration diagram for each use case provided"
Now there are 4 'detailed' use cases provided but the Use Case diagram has a few more. I assume that they mean
you should create diagrams for only the 4 detailed use cases and not 'Log In' and 'Create Profile' which are on the Use Case Diagram.
Some confirmation of my assumption would make me feel esaier about leaving them out...