You can allow another user to edit your diagram by sharing your environment with the role “Administrator”.

1. Click on the environment name at the top right side.
2. Click “Manage environment”.
3. On the “Manage Environment” page, click “Invite Users”.
4. On the new dialog, enter de email and select the role “Administrator”.
5. Click “Send invitation”.
6. The new user will receive an email for confirmation. Ask him to accept the invitation.