Changing admin credentials with form-realm.properties

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I've successfully installed StreamSets with the Clouder Manager on my CentOS 7 Host. The standard password for user admin is admin. Unfortunately I'm not able to change the admin password or add new users over the Web-GUI.

What I did so far:

• Stopped StreamSets role with Cloudera Manager
• Deleted all folder under /run/cloudera-scm-agent/process/*-streamsets-DATACOLLECTOR/
• Commented out standard users and added new user to file form-realm.properties under /opt/cloudera/parcels/STREAMSETS_DATACOLLECTOR/etc/
• Restarted StreamSets service with Cloudera Manager

After starting the service via Cloudera Manager I can see inside logs that StreamSets uses the same standard users like in the first installation

CONFIGURED_USERS: admin: MD5:21232f297a57a5a743894a0e4a801fc3,user,admin;guest: MD5:084e0343a0486ff05530df6c705c8bb4,user,guest;creator: MD5:ee2433259b0fe399b40e81d2c98a38b6,user,creator;manager: MD5:1d0258c2440a8d19e716292b231e3190,user,manager

Any suggestions how to change the standard user credentials?

Thanks