How to configure a Postgres DB at AWS?

Hi guys I read like described the blog post how to set up an app at AWS with the Mendix software subscription, but dont get how to configure a (new) postgres database? When trying to start the app at the server I got this m2ee(admin): start INFO: Trying to start the MxRuntime... Database password not configured, please provide now: ERROR: Executing start did not succeed: result: 1, message: DatabaseType has no value INFO: Waiting for the application to shutdown... INFO: The application has been stopped successfully. m2ee(admin):   I read that the image has also a Postgres db, but wondering where this db is, what the dbname and passwords are? Anyone more info about this stuff  
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