Another member of the group was opening an account and I want to remove mine, as I want to join the other one..
Rossella,
Welcome to the community. Below is some information on how to cancel or remove an account. It depends on the account type.
Business Class - https://help.trello.com/article/836-cancel-trello-business-class
Personal - https://help.trello.com/article/749-deleting-your-trello-account
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