phpmyadmin isn’t in the default installed yum repositories. Therefore we have to enable a repository that does contain phpmyadmin. EPEL is such a repository. See here how to enable EPEL.
After that it’s really simple:
yum install phpmyadmin
cd /etc/httpd/conf.d/ nano phpMyAdmin.conf
and change allow from 127.0.0.1 to allow from 127.0.0.1 192.168.1.0/24 (for example)
service httpd reload service mysqld restart
and browse http://192.168.1.1/phpmyadmin