while googling on how to install node on my centos box, I found this link : https://github.com/joyent/node/wiki/Installing-Node.js-via-package-manager.
This page suggests that I do the following. "RHEL/CentOS/Scientific Linux 6
Node.js and npm are available from the Fedora Extra Packages for Enterprise Linux (EPEL) repository. If you haven't already done so, first enable(https://fedoraproject.org/wiki/EPEL#How_can_I_use_these_extra_packages.3F) EPEL and then run the following command to install node and npm:"
I don't know how to enable it -- can someone step me through the steps ?