Reasons to Report a User
Users should be reported if their user icon, profile page, About Me, or What I'm Working On is inappropriate, or if they have an inappropriate username. For any other reasons, the user should be reported by contacting the Scratch Team and describing the situation with more detail.
An inappropriate project or studio should be reported through its own report button, not the user report button. Additionally, inappropriate content on the forums should be reported using the report button in the bottom-right hand corner of the post.