Hi Christelle
Welcome to the Trello community!
If you're referring to a Free Workspace and you're a Workspace member you can upgrade your team to Trello Premium, which adds several features to make managing teams a bit easier, including the ability for Workspace administrators to take control of all boards in the Workspace. You can sign up for Premium here if that's the case: https://trello.com/premium.
What you can do is start a Premium free trial on the workspace this board sits in. The Premium workspace admins have the ability to administrate all boards in the workspace, and as a result, when you start the trial, you'll be able to close and delete any board in the workspace, manage its members, etc. Starting a free trial does not require a credit card and you are totally not obliged to continue a subscription after the trial.
Here are the steps you'll need to follow:
- Head over to https://trello.com/free-trial
- Start a Premium free trial on the workspace in which boards were created.
- After that's started, head over to the board you've linked
Please let us know if you have any other questions or concerns, we’d be happy to help.
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