The OpenVPN config file structure on ClearOS is non-standard (For example there is no server.conf), so I was unsure where to put the directive. However, as it turns out enabling the Management console is as simple as adding the following to
management localhost 7505
The port is arbitrary: any unused port will do. Localhost restricts connections to the local machine, which is smart if you do not have a password to secure the connection.
To access the management interface using telenet, issue the following from the clearOS box:
telnet localhost 7505 #When the prompt comes up, issue a command such as "status"