You can allow another user to edit your diagram by sharing your environment with the role “Administrator”.
- Click on the environment name at the top right side.
- Click “Manage environment”.
- On the “Manage Environment” page, click “Invite Users”.
- On the new dialog, enter de email and select the role “Administrator”.
- Click “Send invitation”.
- The new user will receive an email for confirmation. Ask him to accept the invitation.