I'm assuming you're asking about removing yourself from an entire HIpChat Cloud instance - i.e. deleting the account associated with your email address. Head over to https://www.hipchat.com/account/delete - you'll sign in with the email address and password for the team you joined by mistake.
The web interface will require you to type your password again to confirm you really want to delete your account.
After that, you're free to join the team you meant to join with your email address.
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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