I'm guessing "rc" is the script or launching program for Cadence. This means either the installation didn't set your path, or you have to logout/login again so that the rc tool is in your path.
FC probably runs "update" on a daily basis, so by now you should be able to run
locate */rc
and get back one or two full paths -- one of which is probably related to your Cadence installation and which you should run (with the full path).