I'm using the free version, and a person named A made several boards while using our trello and quit. I want to delete that account or change the permission account on the board, is it possible?
If you are admin you can remove person A from a board :
https://support.atlassian.com/trello/docs/removing-a-member-from-a-board/
Delete a member in general is only for premium Trello I think
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