If you need to install the EPEL repository in cPanel for Centos 5.3, here is how you do it! Download the latest EPEL repository for i386:
Then, download the latest EPEL repository for x86_64
Run the rpm install command:
rpm -Uvh epel-release-5*.rpm
If you want to change the priority of the repository edit this file : /etc/yum.repos.d/epel.repo and change this value "priority".