You won't find the passwords in the database, because these are encrypted for security reasons. But try MxAdmin with password probably ‘1’. You can check this in the modeler in the Project Explorer under Project → Security → tab Administrator. Under tab demo_users you will see some demo_users, if any are defined. Creating new users is done by logging into your app with any user having administration credentials.
Hi Jayant,
on the first run, check the credentials in the project security, or roles under the "demo users”
To check where the database is stored, go to the project settings: