How do I use root to start Cassandra?

I am attempting to use the root user as the cassandra user but getting an error in the output log: Running Cassandra as root user or group is not recommended - please start Cassandra using a different system user. If you really want to force running Cassandra as root, use -R command line option. I understand what it is saying but I am not starting cassandra from the command line, I am using the "service dse start/stop" where do I add that -R