Use the above path mentioned by itsmeisuru. It works correctly in BAM 2.4.0. Note that there is a difference in the paths
Configure > Users and Roles > Users > Change Password
vs
Configure > Users and Roles > Change Password
AFAIU the first one is for changing passwords of users of a particular tenant by the tenant admin (in your case super tenant) where as in the second one you can change the password of the current logged in user including super tenant.