How do you join a dorm on Hogwarts extreme?

There's no official "Hogwarts Extreme" game or online platform where you can join a dorm in the way you might in a typical Hogwarts-themed game. The phrase "Hogwarts Extreme" doesn't refer to a known, established game or virtual world. It's possible it's:

* A fan-made game or server: If you encountered this term in a specific online community, forum, or Discord server, the method of joining a dorm would be specific to *that* community's rules and setup. Look for instructions on their website or within the community itself.

* A misremembered name: You might be thinking of a different game with a similar theme.

* A completely fictional term: The phrase itself might not refer to any actual game or online experience.

To find out how to join a dorm, you'll need to provide more context: Where did you hear about "Hogwarts Extreme"? What platform is it supposed to be on (PC, mobile, etc.)? Any additional details you can remember would be helpful.