Hi everyone, I'm a new user and was wondering if anyone can tell me how to set up classes? Thanks.

Hi! To set up a Class Account, you need to be a verified teacher. If you meet this requirement, head on over here! If you don't, sadly you're out of luck. (And you can't try to fake it. Scratch has a system to verify that you are an instructor.)
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Also, next time, please post in Questions About Scratch. It's a much better forum for asking questions. Thanks!