config dba

Change the password of any database user account, except reserved system users (sys_*) and ybadmin.

config dba password <username>
For example:
YBCLI(44766) (PRIMARY - yb98-mgr0)> config dba password ybd_test
Enter password for dba user ybd_test: 
Enter password for dba user ybd_test again: 
DBA user password has been updated successfully.

yellowbrick=# \c yellowbrick_test ybd_test
Password for user ybd_test: 
psql (9.5.15, server 9.5.2)
SSL connection (protocol: TLSv1.2, cipher: ECDHE-RSA-AES256-GCM-SHA384, bits: 256, compression: off)
You are now connected to database "yellowbrick_test" as user "ybd_test".