how to set dfs.namenode.delegation.token.renew-interval in gui, set in advanced configuration snippets but not working

[#1]

How should I set dfs.namenode.delegation.token.renew-interval & 

dfs.namenode.delegation.token.max-lifetime in gui of Cloudera Manager for HDFS ?

I have set them in advanced configuration snippets for HDFS Service Advanced Configuration Snippet ( safety valve) for hdfs-site.xml

Thanks

[#2]

Depends what you are trying todo.

I was after a test system to see what happened at expiry time of the kerberos ticket.

I could never get the values set by the web interface to work.

In the end I logged into the cloudera node, used kadmin.local and set the max lifetimes for a kerberos ticket for the appropiate principal.