The Screen for securing the JMX console lists a jboss.org wiki (http://www.jboss.org/community/wiki/SecureJBoss) as reference.
We should point it to our installation guide which has the same information.

The URL should be something like this, please confirm with docs team.
http://www.redhat.com/docs/en-US/JBoss_Enterprise_Application_Platform/5.0.0/html-single/Installation_Guide/index.html#Post-Installation

Attaching screenshot.