This should have been trivial to find in the KnowledgeBase. In fact, I’ll go further, it should have been obvious how to do this just by browsing the control panel. Well it wasn’t (at least for me 🙁 )
The tutorial (video) leads one through setting up a database, but one can do that by just clicking buttons and following the screens. It also says that one can change the password later. It says that, but it doesn’t say how and it doesn’t provide a pointer to the information.