From Test-Scratch-Wiki

The report button below a project.
To report an inappropriate project, click the "Report this" link below the project. When reporting a comment, a link will be below the comment. For a forum post, click the Report link beneath the post. For a user, the report button is below the "What I've Been Doing" section of their user page. For a studio, the report button is underneath the thumbnail.

Certain things can also be reported through contacting the Scratch Team, especially more complicated things such as users getting around a ban.

See Also

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