If you don’t have important data in Cloudbreak, you can drop the db using root and do a...
cbd delete
Switch back to the cloudbreak user and Edit the ‘Profile’ file in your cloud break deployment directory (i.e. /var/lib/cloudbreak-deployment). Then export the username and password you would like to use as the default user.
export UAA_DEFAULT_USER_EMAIL=admin@example.com
export UAA_DEFAULT_USER_PW=mypass
This will override the default settings. Then...
cbd init
cbd start
On startup, your default settings should be displayed as being changed.