Dear Trixie,
Samsung advises to use a lower version off PostgreSQL, see link below:
http://displaysolutions.samsung.com/docs/pages/viewpage.action?pageId=2064870
You can also change the password in the database, please find the following table
Database>magicinfo>Schemas>Public>Tables>mi_user_info_user
If you change the password details here in: $2a$10$QOrOX5IOGdQ75nv4LqWigeWA35MOLHf8NszMhl2.UfWlriNdnnAp6
That specific user will have the following password: Axk7ALQkg6
Kind regards,
Pepijn.