Default Super-User for Master Data Services

Hello,

I have a question about the administrator account which must be specified during the setup of the MDS database with the "Create Database Wizard". -> "This account will be automatically granted full access to all models. You can configure only one account with this permission."

My question is:

Where is this account still used by default? We want to change the password of this admin account and I wonder if I need to enter or re-enter this new password somewhere? 

Thanks,

Maik