While Trello Support is not able to make administrative changes on behalf of a user, there's some guidance on how to potentially overcome the issue at hand. Please check out http://help.trello.com/article/768-changing-the-admins-of-a-team-or-board for more detailed information about that.
If for some reason none of the mentioned items work in your favor, it might be best to make anew board, and then move each list from the existing board to the new. Moving each list will keep comments and activity in tact, and you'll just need to add other members to the new board. You'll then be the admin of the new board since you created it.
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A blank Trello board can be both a beautiful and intimidating thing. How many lists should I have? Is creating 10 labels overkill? How can I best track my progress? Is there a way...
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