Yes, they can edit a board that you have created if board permissions are set as Everyone can change (board default) or "Everyone can edit content, owners can change structure". If you'd like to change these permissions to only letting the owner of the board, please do the following:
- Click on the gear wheel
- Click Board Permissions
- Choose Only Owners can change
For more information board permissions please check out this article right here.
If you have any questions about board permissions, please feel free to reach out to our customer success team right here. We are available 24/7 and happy to assist :)