Yes, command line, launched from Bitnami Dasboard on Google Console.
So, when I follow that link what @michiel posted, I have (on WordPress Multisite), successfully changed 'user' with 'myusername', but than in WOrdpress Dashboard I can access ONLY ON MAIN SITE and I don't have any access ANYMORE on NETWORK DASHBOARD (except trough additional Super Admin) and ALSO when I launch Google Console Dashboard, there is still default bitnami username 'user' (not the changed). When I with same commands revert back to 'user', it again works all in WordPress vs default user (ID=1). Also, creating additional Super Admin, I can change (ie) email of 'user' from 'example' email (as that is also security issue), I can also removde it Super Admin privilegies vs. WordPress, but I can't remove it from MYSQL in any single variation.
Hopefully, I was clear, if not - another way is:
- How to change (or remove) Bitnami default user name ('user') to 'myusername' ON (specific) Google Launchpad? Could be trough command line or trough Google Console Dashboard (whatever).