The EPEL repository can be made available to your server by installing a special package called epel-release. This will reconfigure your repository list and give you access to the EPEL packages.
To install, just type:
sudo yum install epel-release
Now that the EPEL repo is configured, you can install the phpMyAdmin package using the yum packaging system by typing:
sudo yum install phpmyadmin
sudo vi /etc/httpd/conf.d/phpMyAdmin.conf
Change any lines that read Require ip 127.0.0.1 or Allow from 127.0.0.1 to refer to your connection's IP address.
You may also need to change mysql server ip:
sudo vi /etc/phpMyAdmin/config.inc.php